v2.0

1. added TagAdapter and make it easier to create and edit TagViewGroup.
2. moved AnimatorUtils out of the library to make it clean.

v1.5

add bounds checking when direction changed

v1.4

fixed some bugs and optimized

v1.3

1. fixed the bug that lines draw wrong when target sdk is less than or equal to 4.3
2. add animation Properties

add property and fixed bug

1. add CircleInnerRadius property in animation.
2. fixed some bug

v1.1

add getter and setter methods

The first release

v1.0

add TagViewGroup attrs