Gradle update

Gradle wrapper update (2.2.1)
Build Gradle plugin update (1.0.0-rc3)
Build Tools and target SDK updated to lastest
YoutubePlayerApi no longer exist on gradle (not uses jar library)
Fix for issue #12 and #20

Fixed SecondView positionig in Maximized State
Fixed Preview in Android Studio (DraggablePanel should be treated as
RelativeLayout) ex: layout\activity_tv_shows_sample.xml
Fixed horizontal drag issues
Changes in ScaleTransformer isNextToLeftBound & isNextToRightBound methods
Removed unnecessary variables & methods

Every methods/variables related to last position.
This was used in old onLayout() implementation
Changed data type in all dimensions related fields/methods

float to int everywhere except scaleFactor
ResizeTransformer Fix

Changed implementatnio of position calculation
Changed implemenation of getMinWidth() method
Fixed sample app (I forgot about that in prev commit)
Cleaned up Transformers code

Removed unnecesary metods & variables
Methods where size is calculated are merged - now in one pas of
dragEvent dragView is redrawed only once, not twice
merge conficts
downgrade gradle plugin
style update
Unused import removed
Updated README & MINIMUM_DX value
Fix for secondView issue with ScaleStransformer
Fix for ResiezeTransformer issue
Style update

This should be at end
Small improvements associated with VerticalDrag in ResizeTransformer
gradle update

especially for Travis
Revert "gradle update"

This reverts commit d3f77f794ac55e0b97716ead23fe67eaadaf7824.
the last approach to the updating
Revert "the last approach to the updating"

This reverts commit 27e35d7aef10633c210a2c19bbc46ac2cc52204d.