Refactored allowed extensions into array and added new values
Merge pull request #207 from alphagov/add_new_open_files_allowed

Refactored allowed extensions into array and added new values
Add styling to file uploads

Specifically, add a style for the upload when
featured with a notice of the last uploaded file.
Fix IE stylesheets compilation

They weren't compiling if you ran the 'watch'
task.