Bug fix for new pull request

[avenwu]

Hi @tigerjj
This project is really helpful to handle the manual frame-animation for my case;
However there was some bugs which can be polished, I've fork the project and made some changes to fix these issues:
#2 #9 #4 #3

1. fix warning when reuse bitmap with option.in;
2. fix animation frozen issue after Home press
3. FasterAnimationsContainer is no longer singleton, so each ImageView may control it's animation;
4. global bitmap cache supported;

Since the project is kind of old, and I upgraded to Android Studio which make the diff really big, so I want to know if you'd like these change before send any Pull Request:
The mainly changes are FasterAnimationsContainer.java with LifoCache supported
click to see diff

[tigerjj]

Sorry I just saw your comment. I will review your code soon.