remove ReviewIdentitiesActivity

// FREEBIE
Fixing race condition and other mistakes. Fixes #1603.

// FREEBIE
Merge pull request #1630 from mcginty/remove-keys-list

remove ReviewIdentitiesActivity
Merge branch 'group_settings' of https://github.com/agrajaghh/TextSecure into agrajaghh-group_settings
add a couple more (mocked) categories, wip
tad more reorganizing, phrasing
add dynamic summaries