add SlidingMenu and ActionBarSherlock libs, and modify SlidingActivity extends to SherlockActivity
Merge branch 'master' of https://github.com/awind/DRadio

Conflicts:
	app/src/main/java/com/awind/dradio/activity/PlayActivity.java
	app/src/main/res/values/dimens.xml
	app/src/main/res/values/strings.xml