Added variables for store basic auth and base64 implementation.
Reorginize all source code, put extern in function prototypes.

Changed global variables to static and provide http_proxy_url
function to modify them.

Changed _VERBOSE define to _DEBUG that is more common.

TODO: Add init and free method.
Added missing free(filename) into http_proxy_url.
Merge branch 'master' of https://github.com/leon9/http-tiny into leon9-master

Conflicts:
	http.c
Added support of basic authentification using external base64 encoder
this should be set with http_set_base64_encoder before call
http_set_basic_auth.
Added support in http library to introduce basic auth header in request's.
Added http-basic-auth test program.
Modified header disclaimers in source files, added my copyright.
Updated README.md.