Wireless Charging Version 1

A little bit of a hack to get this working, but my intention is to
rewrite this plug-in a little bit when I have more time. Committing so I
can do a pull-request and install via Play Store
Cleaned up Toast entries

Forgot a couple toast notifications.
Fixed bug with edit activity after setting wireless

Tested editing activity both with and without not checked, all power
source types. No more force closed of the EditActivity screen
Merge branch 'master' of https://github.com/khalaan/pslp into khalaan-master
Merge branch 'khalaan-master'
Tidy a little.

In particular, description of AC must remain slightly ugly so that people
with car chargers etc. know what to pick (otherwise they might reasonably
think "it's my phone's USB port, and it's not really AC...")