Gmail style user pics, 2nd try
* sfuhrm/gmail-style-user-pics:
Changed the fallback char from 'K' to '?'. The riddler was here ;).
Using Android proposed colors as contact color palette now: http://developer.android.com/design/style/color.html
Fixed NPE found by blackbox87 ... thanks pal!
Added more finer characters as proposed by cketti
Caching also the calculated anonymous bitmap as proposed by maniac103. This removes a lot of code for special handling unknown contacts.
Bugfix for negative modulo result indexing the palette array
Changed hash based color calc to a hash indexed palette as discussed in the pull request.
GMail-app-style generated colorful one-letter contact pictures for pictureless contacts
Conflicts:
src/com/fsck/k9/activity/misc/ContactPictureLoader.java
src/com/fsck/k9/fragment/MessageListFragment.java