Changed url shortener to pwny.at

Signed-off-by: CorriePie <corriekay.pinkie@outlook.com>
Added a delete all mail, and a mark all as read function to the inbox system.

Addressses #21

Signed-off-by: CorriePie <corriekay.pinkie@outlook.com>
Merge pull request #27 from CorrieKay/TestBranch

Test branch