Fix multiple keychange errors (#1334)

* Don't attempt to send a message unless we've successfully built device-messages
* Only process message exception when we're done with retries.

// FREEBIE

Podfile.lock

@@ -130,7 +130,7 @@ EXTERNAL SOURCES:
 
 CHECKOUT OPTIONS:
   SignalServiceKit:
-    :commit: 9821e0c0d03a01f556680a6ae869b70bf5b93681
+    :commit: a0df56a68e5db7729a209b069bcdfd56e6d7e92a
     :git: https://github.com/WhisperSystems/SignalServiceKit.git
   SocketRocket:
     :commit: 8096fef47d582bff8ae3758c9ae7af1d55ea53d6

Signal/Signal-Info.plist

@@ -21,7 +21,7 @@
 	<key>CFBundlePackageType</key>
 	<string>APPL</string>
 	<key>CFBundleShortVersionString</key>
-	<string>2.6.0</string>
+	<string>2.5.0</string>
 	<key>CFBundleSignature</key>
 	<string>????</string>
 	<key>CFBundleURLTypes</key>
@@ -38,7 +38,7 @@
 		</dict>
 	</array>
 	<key>CFBundleVersion</key>
-	<string>2.5.0.15</string>
+	<string>2.5.0.16</string>
 	<key>ITSAppUsesNonExemptEncryption</key>
 	<false/>
 	<key>LOGS_EMAIL</key>