* Update copyright years.
* Update erlang.mk.
* Fix triq testing.

About the same except for functions with tons of tests per clauses,
like parse_content_language/1.

Also rename the macros for inline lowercasing to ?LOWER,
and move the type detection macros to cow_parse.hrl.

Supports Basic, Digest and Bearer schemes only.

From RFC7235, RFC2617 and RFC6750.

From RFC7230 and RFC3986.

The new function now validates that the characters are correct,
but does not go as far as validate segment sizes or number of
segments. Its main purpose is still to split host and port.

From RFC7233.

From RFC7233.

From RFC7231 and RFC5646.

The ABNF for language tags is terrible. It makes parsing efficiently
a big challenge and the result is this huge ugly set of functions.
Thankfully triq allows us to make sure the implementation is correct.
A large number of examples has also been extracted from both RFCs.

The various ?IS_ALPHA(C), ?IS_TOKEN(C) and so on have received a
change: they now use 'orelse' instead of ';'. This is because in
this new code we need to check more than one character per clause.

The compilation time for this module increased dramatically.
Apparently happens because the guards are too big. Using ranges
($a =< C =< $z) instead of the current solution makes compilation
much faster, but the function executes twice as slow which is not
acceptable.

From RFC7232.

Nearly twice as fast as current Cowboy code.