+ add .jshintrc 

Attempt to introduce "linting" via 'jshint' node module.

_Note:_ Using jshint's _default_ configuration and running it against _lib/*.js_:
`$ jshint --config .jshintrc lib/` reports `135` warnings/errors

see also: https://raw2.github.com/jshint/jshint/master/examples/.jshintrc

regards
~david