Update changelog/ for new version of calens

We've reworked calens[1] a bit, the changelog/releases file is not
needed any more. Insteady, the release date is stored in the dir name
which contains the changelog entries.

[1] https://github.com/restic/calens

changelog/0.7.2_2017-09-13/issue-1132

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+Enhancement: Make `key` command always prompt for a password
+
+The `key` command now prompts for a password even if the original password
+to access a repo has been specified via the `RESTIC_PASSWORD` environment
+variable or a password file.
+
+https://github.com/restic/restic/issues/1132
+https://github.com/restic/restic/pull/1133

changelog/0.7.2_2017-09-13/issue-1167

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+Bugfix: Do not create a local repo unless `init` is used
+
+When a restic command other than `init` is used with a local repository and the
+repository directory does not exist, restic creates the directory structure.
+That's an error, only the `init` command should create the dir.
+
+https://github.com/restic/restic/issues/1167
+https://github.com/restic/restic/pull/1182

changelog/0.7.2_2017-09-13/issue-1179

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+Enhancement: Resolve name conflicts, append a counter
+
+https://github.com/restic/restic/issues/1179
+https://github.com/restic/restic/pull/1209

changelog/0.7.2_2017-09-13/issue-1208

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+Enhancement: Add `--compact` to `snapshots` command
+
+The option `--compact` was added to the `snapshots` command to get a better
+overview of the snapshots in a repo. It limits each snapshot to a single line.
+
+https://github.com/restic/restic/issues/1218
+https://github.com/restic/restic/pull/1223

changelog/0.7.2_2017-09-13/issue-317

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+Enhancement: Add `--exclude-caches` and `--exclude-if-present`
+
+A new option `--exclude-caches` was added that allows excluding cache
+directories (that are tagged as such). This is a special case of a more generic
+option `--exclude-if-present` which excludes a directory if a file with a
+specific name (and contents) is present.
+
+https://github.com/restic/restic/issues/317
+https://github.com/restic/restic/pull/1170
+https://github.com/restic/restic/pull/1224

changelog/0.7.2_2017-09-13/issues-697

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+Enhancement: Automatically generate man pages for all restic commands
+
+https://github.com/restic/restic/issues/697
+https://github.com/restic/restic/pull/1147

changelog/0.7.2_2017-09-13/pull-1044

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+Enhancement: Improve `restore`, do not traverse/load excluded directories
+
+https://github.com/restic/restic/pull/1044

changelog/0.7.2_2017-09-13/pull-1061

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+Enhancement: Add Dockerfile and official Docker image
+
+https://github.com/restic/restic/pull/1061

changelog/0.7.2_2017-09-13/pull-1126

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+Enhancement: Use the standard Go git repository layout, use `dep` for vendoring
+
+The git repository layout was changed to resemble the layout typically used in
+Go projects, we're not using `gb` for building restic any more and vendoring
+the dependencies is now taken care of by `dep`.
+
+https://github.com/restic/restic/pull/1126

changelog/0.7.2_2017-09-13/pull-1134

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+Enhancement: Add support for storing backups on Google Cloud Storage
+
+https://github.com/restic/restic/pull/1134
+https://github.com/restic/restic/pull/1052
+https://github.com/restic/restic/issues/211

changelog/0.7.2_2017-09-13/pull-1144

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+Enhancement: Properly report errors when reading files with exclude patterns
+
+https://github.com/restic/restic/pull/1144

changelog/0.7.2_2017-09-13/pull-1149

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+Enhancement: Add support for storing backups on Microsoft Azure Blob Storage
+
+The library we're using to access the service requires Go 1.8, so restic now
+needs at least Go 1.8.
+
+https://github.com/restic/restic/pull/1149
+https://github.com/restic/restic/pull/1059
+https://github.com/restic/restic/issues/609

changelog/0.7.2_2017-09-13/pull-1164

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+Bugfix: Make the `key remove` command behave as documented
+
+https://github.com/restic/restic/pull/1164

changelog/0.7.2_2017-09-13/pull-1191

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+Bugfix: Make sure to write profiling files on interrupt
+
+Since a few releases restic had the ability to write profiling files for memory
+and CPU usage when `debug` is enabled. It was discovered that when restic is
+interrupted (ctrl+c is pressed), the proper shutdown hook is not run. This is
+now corrected.
+
+https://github.com/restic/restic/pull/1191

changelog/0.7.2_2017-09-13/pull-1196

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+Enhancement: Add `--group-by` to `forget` command for flexible grouping
+
+https://github.com/restic/restic/pull/1196

changelog/0.7.2_2017-09-13/pull-1203

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+Enhancement: Print stats on all BSD systems when SIGINFO (ctrl+t) is received
+
+https://github.com/restic/restic/pull/1203
+https://github.com/restic/restic/pull/1082#issuecomment-326279920
+

changelog/0.7.2_2017-09-13/pull-1205

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+Enhancement: Allow specifying time/date for a backup with `--time`
+
+https://github.com/restic/restic/pull/1205