moving to xml branch
adding xml upload
fix upload form, rewrite models
added hit requests
fix rendering
add response serialization on client
adding login
adding turk status updates
adding mturk functionality
turk requests working, adding payments
adding payment
adding payment
adding payment
hit approval complete
add csv download
adding kyle TODOs and windows hack :)
Making it work in ubuntu.

Also:
- Added favicon
- Added basic error handling for xml submission
Added 'documents' to xml spec; created UI for admin to view tasks.
Made tasks hide when new HITs are uploaded
fixed crash-inducing bugs in auto-payer