HTTP/1.1 client support over eLua net module 
Inspired in Lua socket.http
Author: Vagner Nascimento, July 2010
Led Lab - PUC-Rio, Brazil

Accepts parameters: url, method, source, headers, bytes

Returns a table: {body = 'response body', code = 200, headers = 'All response headers'} or {err = 'something is going wrong'}
Usage:  
	GET -->	http.request{url = 'http://ww.myfavoritehost.com/folder/script.lua?q=anything'}
	POST -->http.request{url = 'http://ww.myfavoritehost.com/script.lua', method = 'POST', source = 'first=1&more=in+ltn12+format', bytes = 50}

*Extra: Encodes a string into its escaped hexadecimal representation.
		http.escape("my strange / string") --> my%20strange%20%2f%20string


*  Because of eLua net module limitations, the default bytes returned is 512. if you need more or less, just define a number of bytes on the input table parameters.