README.md: tweak grammer
Clarify what stream_body is doing
Allows language_range/2 to parse RFC5646 language codes.
Add R16B03-1 to the list of releases to test
Add and document the new multipart code

The old undocumented API is removed entirely.

While a documentation exists for the new API, it will not
be considered set in stone until further testing has been
performed, and a file upload example has been added.

The new API should be a little more efficient than the
old API, especially with smaller messages.
Use the INLINE_LOWERCASE macro in the request parsing code

Since I made it for similar code in cowlib, let's use it here too.
Update copyright years
Allow empty passwords when parsing Basic authorization header
Fix stop_listener/1 spec
Update cowlib to 0.5.1 to fix multipart issues
Cleanup .gitignore
Fix cowboy:stop_listener/1 spec in manual
Merge branch 'master' of git://github.com/pdericson/cowboy
Merge branch 'stop_listener-spec' of git://github.com/s1n4/cowboy
Keep the whitespace from multiline headers

Before, we could have

Header: the value
 is multiline

Become "the valueis multiline".

Now it will properly be "the value is multiline".
Update and improve Websocket chapters in the guide
Fix typespecs of cowboy_websocket:handler_terminate

Pointed out during the ConcuError tutorial by Kostis. Thanks! :-)
Remove cowboy_http:urldecode/1 and urlencode/1

Use cow_qs:urldecode/1 and cow_qs:urlencode/1 instead
Remove R16B03-0 from the list of tested releases
Update cowlib to 0.6.0