version number update to 1.3.1

isVisibleOnScreen function aware of vertical-horizontal screen offsets

OnBubbleClick and OnBackgroundDimClick methods added to listener.

Capability to pass color and drawables as resourceIds

Possible nullpointer bug with layoutBackground

Update to 1.2.1

Show method returns BubbleShowCase object

Update to 1.2.0

RTL support

upgrade to 1.1.0

ShowOnce paramater added

update to 1.0.3

Merge remote-tracking branch 'origin/master'

visibleOnScreen strategy changed to avoid false positives

Update README.md