bump build tools, fix preferences on API19+
Merge remote-tracking branch 'mkl87/master'

multiple changes to merged code:

* add sms app chooser
* change some code to run only on API 19+
* sanitize code
* add siginature level permission to websms's broadcast
* add ads
* clean up

Conflicts:
	SMSdroid/src/main/AndroidManifest.xml
	SMSdroid/src/main/java/de/ub0r/android/smsdroid/Preferences11Activity.java
add release cert info
fix intent chooser + cleanup
fix save messages
changelog
Hotfix for known receivers
updateNewMessageNotification playes notification sound only on SMS_NEW
accidental debug note removed
clean up merged code
minor performance improvement
Working filter with preference.
fix chooser; issue #809
extendable notifications
added support lib v13
merge of big_notify
Merge branch 'master' of https://github.com/greenify/smsdroid

clean up code formatting, remove preference for action buttons
apply new code style globally

no logicall changes made!