Moved to twitter API ver 1.1

1. The module is returned as a table, with no global pollution
2. Made twitter api version 1.1 compatible:
	* Some URL changed
	* Moved to use https (ads dependecy on LuaSec)
do not assert inside library, return "nil, error"

also, add metatable to client for oo-styled access.
Pre-transfer update of the README file with new maintainer, update examples to (hopefully) work with new encapsulated style.