replace quoted:from_url with cowboy_http:urldecode

This change makes the dependency on quoted optional
by adding a minimal urldecode function to cowboy.

A protocol option for setting the urldecoding function
has been added to the cowboy_http_protocol module.
The default value for this option is set to be
equivalent to the default settings for quoted.

{fun cowboy_http:urldecode/2, crash}

A note has been added in the README to document
how to use quoted instead of this function.

A field to store this option value has been added
to the state record in the cowboy_http_protocol
module and the http_req record in include/http.hrl

Functions that previously used quoted:from_url/1
has been updated to require an equivalent function
in addition to the previously required arguments.

This change removes a C compiler from the build
requirements of cowboy. It also removes the requirement
to cross compile the code if the target arch/OS
is different from the arch/OS used to build it.

rebar.config

@@ -1,7 +1,5 @@
 {cover_enabled, true}.
 {deps, [
-	{quoted, "1.2.*",
-		{git, "git://github.com/klaar/quoted.erl.git", {tag, "1.2.0"}}},
 	{proper, "1.0",
 		{git, "git://github.com/manopapad/proper.git", {tag, "v1.0"}}}
 ]}.