example: fix typo in doc http to https

ssl_hello_world_example uses https instead of http.
Fix echo_get/README.md
Fix the SPDY suite for R15
Merge branch 'patch-1' of git://github.com/edgurgel/cowboy
Fix a small typo in a test
Nicer error when NPN isn't available
Merge branch 'typofix' of git://github.com/Etsukata/cowboy
Clarify functions that can only be called once
Fix typespecs for cowboy_req:binding/{2,3} and :bindings/1
Now testing on R15B01+ and maint and master git branches
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