Merge branch 'release/3.7'
Corrected a core data migration crash if the username is empty and also prevent a crash if the password is removed from the keychain
Bumped version to 3.7.1 to support hotfix
Starting themes

- The feature will include:
  - theme browsing
  - activating a theme
  - live preview on your WP.com site
  - searching and filtering

This is the first commit for data retrieval, storage, and title display.
Note that there is a new CoreData model version.
Tie WPAccount to Note

- Allows for easy removal when account is removed
- May need a migration for existing Notes as well, to add the account
  attribute
Fixing incorrect user id sent to Quantcast.
One additional crash fix for when primary blog ID isn't set and NSNumber compareWithNumber fails passing it nil
Screenshots on themes

- Avoid crashing with ideal core data updates and just reload since
  we're loading all themes at once anyways
- Stub detail view
- Stub search bar/filter
Place theme title below screenshot
WIP Theme details screen
OpenSans, more for Theme cell
Change to authenticated themes call

- Authenticated themes call provides premium themes for that blog

- Moved request into WordPressComApi

- Slight styling changes to remove whitespace around screenshot for
  aspect fit images
Attached themes to blog

Authenticated calls to fetch and activate theme has blog attached, so it
makes sense to tie Blog and Theme together for the deletion of Blogs.
Disable rotation for Themes

Disabling for now. Also an update to the rotation-aware
UINavigationController to obey the child's shouldAutorotate.
Open webview for theme preview

Authorization broken, however.
Merge branch 'feature/ios7' of github.com:Automattic/WordPress-iOS into feature/ios7-themes

Conflicts:
	WordPress/Classes/SidebarViewController.m
Update with WPStyleGuide

- Placed themes in new sidebar
Activate and preview theme

- Blog is aware of its current theme
- Activate and preview theme
- Update to WPStyleGuide for base blue colours
- Styling changes for iOS7: full width image on details
Merge branch 'feature/ios7' of github.com:Automattic/WordPress-iOS into feature/ios7-themes

Conflicts:
	WordPress/Classes/NewSidebarViewController.m
Add themes to last menu item for blog

To prepare for the conditional that only admins can view this option