Extract TextSecure strings for i18n.

1) Change all instances which use concatenation to build strings
with variables in them to use string formatting instead.

2) Extract all string literals from layouts and menus into strings.xml

3) Extract all string literals from code into strings.xml
Fix up whitespace tagging and tag detection prompt.

1) Fix up the whitespace tagging so that it's a little more strict.

2) Don't display whitespace tags that we add to our own messages.

3) Make the tag detection prompt a little more visually pleasing.
Fixed RecipientsPanel white-on-white weirdness for Android <= 2.3.

Only appeared when the RecipientsEditor was in the unselected state.
Update passphrase caching notification strategy.

On platforms (API >= 11) that support receiving click events within
a notification, we change the notification format so that users
can "lock" TextSecure with a click.

For all platforms, we change the notification icon in the status
bar from a "lock" to an "unlock," to better reflect the situation.

This is all part of the master plan for eliminating the passphrase
timeout option.
Transifex Schema
Lint warning changes.
Fix for 2.3 ugliness.
Turn avatar images in conversations into QuickContactBadge equivalents.

This requires a few changes to Recipient in order to make sure we
have a Contact URI at click time.  While we're at it, let's git rid
of the OldRecipientProvider, which was for pre-2.0 contact stuff
(no longer supported, woohoo!).
Logging for debugging
Fix for contact lookup on GB.
Fixed auto-initiate layout on GB.
Updated notification icon to look appropriate for all Android versions.
Updated new message notification icon style for all versions of Android.
Take advantage of new ICS+ notification styles.
Bump version number to 0.7
Add note about translation to README
Fix for self-photo lookup bug on 2.3
Bump version to 0.7.1
Resolved some duplicate strings
Include source origin in string key name.

This should help eliminate string duplicates, as well as provide
visibility into where strings in a resource file are being used.