Beginning of libtextsecure refactor.

1) Break out appropriate components.

2) Switch the incoming pipeline from SendReceiveService to
   the JobManager.

jobqueue/src/main/java/org/whispersystems/jobqueue/JobConsumer.java

@@ -16,10 +16,14 @@
  */
 package org.whispersystems.jobqueue;
 
+import android.util.Log;
+
 import org.whispersystems.jobqueue.persistence.PersistentStorage;
 
 public class JobConsumer extends Thread {
 
+  private static final String TAG = JobConsumer.class.getSimpleName();
+
   enum JobResult {
     SUCCESS,
     FAILURE,
@@ -69,6 +73,7 @@ public class JobConsumer extends Thread {
         job.onRun();
         return JobResult.SUCCESS;
       } catch (Throwable throwable) {
+        Log.w(TAG, throwable);
         if (!job.onShouldRetry(throwable)) {
           return JobResult.FAILURE;
         } else if (!job.isRequirementsMet()) {

jobqueue/src/main/java/org/whispersystems/jobqueue/JobManager.java

@@ -39,14 +39,16 @@ public class JobManager implements RequirementListener {
   private final PersistentStorage  persistentStorage;
 
   public JobManager(Context context, String name,
-                    RequirementProvider requirementProvider,
+                    List<RequirementProvider> requirementProviders,
                     JobSerializer jobSerializer, int consumers)
   {
     this.persistentStorage = new PersistentStorage(context, name, jobSerializer);
     eventExecutor.execute(new LoadTask(null));
 
-    if (requirementProvider != null) {
-      requirementProvider.setListener(this);
+    if (requirementProviders != null && !requirementProviders.isEmpty()) {
+      for (RequirementProvider provider : requirementProviders) {
+        provider.setListener(this);
+      }
     }
 
     for (int i=0;i<consumers;i++) {