Make cache work

Conflicts:
	src/net/alliknow/podcatcher/BaseActivity.java
	src/net/alliknow/podcatcher/Podcatcher.java
	src/net/alliknow/podcatcher/model/tasks/remote/LoadRemoteFileTask.java
Update player on play next episode
Refine the details of the http cache usage
Move http cache handling to podcatcher application class so it is
available to all managers

Conflicts:
	src/net/alliknow/podcatcher/Podcatcher.java
Fix load logo bug, move flush to activity

Conflicts:
	src/net/alliknow/podcatcher/Podcatcher.java