Added the dependency "Android SDK Build-tools".
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fix NPE in isPushDestination
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one more try at that one..
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Fix #641 by using standard intent to select group avatar.

The ACTION_GET_CONTENT used with cropping is not supported on all devices.
To make this work more reliably I removed the cropping and MediaStore.EXTRA_OUTPUT.
The image is now read via getContentResolver().openInputStream() which should work on all device including KitKat/CM11.
Merge pull request #946 from DorianScholz/groupavatar

Use standard intent to select group avatar.
refactor and improve contact selection

* unify single and multi contact selection activities
* follow android listview design recommendations more closely
* add contact photos to selection
* change indicator for push to be more obvious
* cache circle-cropped bitmaps
* dedupe numbers when contact has multiple of same phone number

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