Build fixes for latest versions of ABS and ADT.
Fix commit time being off.

Do that by no longer adding arbitrary amounts of time to commits.
Assorted warning fixes.
Add xxhdpi icon and refresh icons to be a higher quality
Implement searching for users.
Fix warnings.
Work around Github not sorting repositories for organizations.

As querying for user repos also works for organizations and user repo
query results are sorted, always query for user repos.
Add support for opening file URLs.
Implement search in file viewer.
Fix share and search icon color.
Remove pointless fallback method for onOptionsItemSelected.

This makes it more obvious what's going on, and fixes the diff viewer
search action as a side effect.
Also strip off line numbers etc. from file names.
Show search instead of explore item in action bar.
Streamline sharing contents.
Remove share menu item for own user page.
Fix NPE when trying to search in diff.
Move search UI to action bar.
Simplify and fix repo browsing logic.
Streamline tab creation.
Remove some debug spam.