Add basic support for XML API access

You can also specify the format you want the response in with a query argument.
Fix bug in removing permissions
Simplify/Streamline permission listing on personal page
Rename Accepts header properties to is_* form

Request.is_json is being added in Flask 0.11, and I'm jumping the gun a little bit.
Bugfix: Clipboard buttons will still work after sorting the table
Add API keys for users

Lets users access easily information from the external API. Restricted to GET requests only.
Add API keys to the XML output for /request/personal

Keeping parity with the JSON API
Move Decimal pretty printing to a new method

simplify when I want commas and not, so I can get consistent values when I need them. Also means I can remove the hackies with subclassing Decimal.
Remove Py3.2 testing

Flask doesn't support 3.2, so I don't either.