Brand new UI

Changed dialog's UI completely
Some improvements

Release version 1.2.0

-Fixed an issue that prevented installation of 2 apps using this library alongside.
-Upgraded all dependency versions.
-Added log to show developer when the WRITE_EXTERNAL_STORAGE permission has not granted and user clicks on direct APK download.
-Added comments for gradle dependency section.

Improvements

Changed min sdk to 16
Made dialog's width match_parent
Added some comments
some improvements

Initial Release

First release of library