Tidy up code.

Delete logging, and unused code.
Bug 958709 – Detect task removed events and send a broadcast intent.
Change logtag.
Check that the user has a web runtime available, and if not offer to download from the play store.

When it comes back, check that the web runtime has been installed, then launch the app.
Added configChanges to the template.
Merge pull request #2 from jhugman/master

Added detection of Recent Apps List swipe away, and send an intent to the runtime. r=mfinkle