Comment out maven central dependency on support-v4 r7.

Latest version (r13) is not even on central. In fact, it is not
official!

A dependency on r13 that is bundled with the SDK needs to be added.
Currently, the module only builds with said dependency added locally.
Implement a big-text style notification to add disconnect action.
Keep upstream behavior that dismisses notification on 0 connected peer.

Although why we have the icon resource to indicate 0 connected peer to
begin with, I don't know. This would only ever to be displayed briefly
before the notification gets cancelled.
Comment.
Move the scheduling of service restart upstream from onDestroy().
Comment.

HEAD^ cherry-picked a commit from potential fix to issue #51.
Merge branch 'notification-disconnect' of github.com:santa4nt/litecoin-wallet into santa4nt-notification-disconnect

Conflicts:
	wallet/src/de/schildbach/wallet/service/BlockchainServiceImpl.java
Removing notification from blackberry

Should close #54