Prepare for 4.2.1
Bump to version 4.2.1
Add read external permission
Add setSurface Demo
Merge branch 'master' of https://github.com/yixia/VitamioBundle

# By Crossle Song
# Via Crossle Song
* 'master' of https://github.com/yixia/VitamioBundle:
  Add setSurface Demo
  Add read external permission
  Bump to version 4.2.1
  Prepare for 4.2.1

Conflicts:
	vitamio/res/raw/libarm.so
	vitamio/src/io/vov/vitamio/widget/VideoView.java