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

major changes to merged code:

* fix ignoring settings and stuff
* fix save drafts
* add note to settings
* add new permission
* clean up
* add ads

Conflicts:
	WebSMS/src/main/AndroidManifest.xml
	WebSMS/src/main/java/de/ub0r/android/websms/Preferences11Activity.java
add release cert info
check for default sms app, not just existence
changelog