Taptargetview

23ea4a6` Disallow multiple cancel calls from being fired (58)
`7588067` Ignore clicks when no center is yet defined (56)

d545673` Use proper method of determining bounding parent boundaries (53)
`f445b5f` Add ids to tap targets, pass last tap target when sequence is cancelled (51)

This is a bugfix release, no new features have been added.

`204dff6` Fix listener variable shadowing and click handling (48)
`59c29f4` Clip to bounding parent if present
`1a4b53c` Use correct invalidation bounds and improve animations (46)

432485b` Add support for transparent targets
`460bd4b` Add text color options. Fixes 27
`3a0496c` Add text size options. Fixes 40
`e3af3b0` Add back button handling. Supersedes 32
`4f7d615` Ensure center is defined before drawing. Fixes 37

3c5be37` Initial support for Toolbar related views (34)
`aa5201e` Use view outlines for shadows on Lollipop and above
`cac04b9` Don't draw a circle via a path
`13a8cbe` Don't use view cache to draw the view
`0a0d2a2` Add support for dialogs, custom parents (31)
`0f40189` Min SDK 14, fixes 29
`fe748f2` Add dismiss listener, fixes 26

**NOTE**: This is an API breaking release.

`d0db08e` Fix for 25
`38af02a` Fix issue with clipping and older APIs
`c33a724` Only invalidate the drawing bounds
`f93b0cc` Add support for Spannable strings (20)
`11e70a0` Make descriptions optional (17)
`3c520f3` Remove synthetic accessors
`80964cd` Implement sequences and custom tap targets (14)
`c9c27e7` Add onTargetCancel callback (3)