Add Cowboy 0.8 support
Improve errors for static files (cowboy/webmachine)
Adding field_name to #uploaded_file record
Add uploaded_file API module and docs
Separate rebar confs, add backwards compat cb

Also, added slightly new rebar
Atomize the request method
Add comment for mochiweb max_request_size override
Fix header handling: Expires should be set elsewhere, and header
values for files should not be discarded.
header functions moved to utils (wip, not working)
Checking for atom headers in util
Re-instate Cowboy static file handling