Fix bunch of potential NPEs. Added some comments. Fixed typos.
Now that the library can be started without an Activity/Context, care has to be taken so it doesn't attempt to use a null context.
Missing bracket. o.O
Fix incorrect listener that I accidentally inverted.
And finally restoring the right logic when the opened token has been updated.
I should get some rest
Fix 2 typos in the comments.
Merge pull request #40 from Gryzor/master

Fix bunch of potential NPEs. Added some comments. Fixed typos. Remove duplicated if statement.