Implemented AFNetworking 2.2.3 support.
Merge branch 'develop' into issue/1618-AFNetworking2
Fixes for the AFNetworking 2.2.3 migration.
Some additional fixes for AFNetworking 2.2.3.
Updated WordPressApi pod location for AFNetworking 2.2.3.
Merged develop -> issue/1618-AFNetworking2.
Merge branch 'develop' into issue/1618-AFNetworking2
Change format to accept integers, not objects
Merge pull request #1722 from wordpress-mobile/issues/1721-string-format-issues

Change format to accept integers, not objects
Merge branch 'develop' into issue/1618-AFNetworking2

Conflicts:
	WordPress/Classes/ReaderPost.m
Merge pull request #1703 from wordpress-mobile/issue/1618-AFNetworking2

Issue/1618 - AFNetworking 2.2.3 support
Now ReaderPost::globalID attribute is optional
Merge pull request #1727 from wordpress-mobile/issues/1726-updates-data-model

Now ReaderPost::globalID attribute is optional
Prevents a crash when the reader topic changes
Merge pull request #1731 from wordpress-mobile/issues/1725-fixing-crash-in-reader

Issue #1725: Prevents a crash when the reader topic changes