Adding word count diffs as a property for 'Editor Closed'.

Added word_count word_diff_count properties to the 'Editor Closed'
property to see what a typical length post looks like.
changes endpoint from reader/topics to read/tags
updates Blogs I Follow and Posts I Like to use read endpoint
adds isWPCom boolean to ReaderPost
stores is_external data in isWPCom. updates social buttons to use isWPCom
supports featured_media object on read endpoint
Merge branch 'develop' into issue/1018-reader-endpoint

Conflicts:
	WordPress/Classes/ReaderPostView.m
converts tabs to spaces and other general style cleanups to match the style guide
changes references from "topics" to "tags"
converts some tabs to spaces
Added link to stats to access the web version.
Added stats tracking for users who open the web version of stats.
Fixing typo with StatsSummary variable name.

Renamed totalCatagories to totalCategories.
Watch for badge count changes and update tab bar badge count accordingly
updates odd ternary operators
Merge pull request #1276 from wordpress-mobile/issue/1018-reader-endpoint

#1018 changes reader endpoint from reader to read
all endpoints now use ISO 8601 datetime versus epoch
Modified text, removed blue coloring, and added disclosure indicator.
Merge pull request #1282 from wordpress-mobile/issue/1018-fix_for_infinite_load

all endpoints now use ISO 8601 datetime versus epoch
Merge pull request #1278 from wordpress-mobile/issue/fix-typo-with-stats-variable

Fixing typo with StatsSummary variable name.
Merge pull request #1280 from wordpress-mobile/issue/674-tabbar-badge-count

Watch for badge count changes and update tab bar badge count accordingly