Delete topics when account changes.
Updates ReaderPost entity making a topic relationship required.
Initial switch over to Pod of WPiOS Stats
Merge branch 'develop' of github.com:wordpress-mobile/WordPress-iOS into issues/1778-delete-topics
Merge branch 'develop' of github.com:wordpress-mobile/WordPress-iOS into issues/1778-delete-topics
Add tests for reader cleanup.

Fixes broken tests for accounts and concurrency.
Removes .h file from other test.
Fix for showing posts opened via a url scheme in the reader.

Misc formatting tweaks.
Switch to CocoaPod repo for stats pod, added NSObject+SafeExpectation
Merge branch 'develop' into issue/1790-stats-pod

Conflicts:
	WordPress/WordPress.xcodeproj/project.pbxproj
Post editor Cocoapod integration checkpoint; updated CTAssetPicker to 2.2.2;
Merge branch 'develop' of github.com:wordpress-mobile/WordPress-iOS into feature/pod-editor

* 'develop' of github.com:wordpress-mobile/WordPress-iOS:
  Adds missing saveDerivedCOntext call
  Fixes context save call
  Fixes fetchPosts remote service
  Include all projects with WordPress in it for now
  Hack in the Pods/WordPress-iOS-Shared directory for strings files
Merge branch 'develop' of github.com:wordpress-mobile/WordPress-iOS into issues/1778-delete-topics
Clean up one-off posts with no topic, like those loaded via URL scheme

Minor code style tweak
Records error that was previously ignored.
Implement missing stats delegate method to show web stats view
Handle the current topic being deleted on the server.

Classes do not keep their only references to the current topic
Properly log errors fetching the current topic by ID.
Handle unsubscribed topics that are also recommended.
Refactor for clarity
Add missing negation to comparison check.
Correctly set, get, and delete current topic.

Clear currentTopic when deleting topic
When retriving currentTopic, let first error check fall through.
Ensure currenTopic's objectID is not temporary.
Save context via ContextManager
Add support for obtaining object's permanent ID to ContextManager
Refresh the buttons on the post editor screen after appearing;