utils and API docs
update API docs for 08/16
move ast to support a tree-walker/visitor like patterns in future.
move ezhil.py to handle multiple files at the command line
Interpreter.py has a some doc strings added
Visitor updates
Merge branch 'master' of https://github.com/arcturusannamalai/Ezhil-Lang
update webpage to have equal English/Tamil text for international audience