Aatdark issue5843

ACRA added for log and exception acquisition in k9. Writes a crash log file like [0] to the sd card and displays a toast.
To test apply the patch in [1] and navigate to "Compose Message" which will trigger a exception.

[0] http://pastebin.com/bT94L0vh
[1] http://pastebin.com/vJhgCh40