update minSdkVersion to 21 (#843)

* set minSdkVersion to 21

* use elevation instead of additional views for shadow

* clean up code occurrences

* remove drawable compat code

* remove no longer needed resources

* remove unneeded android:clipChildren="false"

* Revert "remove no longer needed resources"

This reverts commit 67a4d6f8d87b3f116b95d90dfb48f350d342f503.

* remove no longer needed resources (this time the right ones)
This commit is contained in:
Konrad Pozniak 2018-09-16 18:54:12 +02:00 committed by GitHub
commit 4402f3d337
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40 changed files with 35 additions and 249 deletions

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