Add .jshintrc to project

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

_Update:_
I guess this _will_ help in the long run keep the project maintainable as well as to reduce issues during merge processes etc. Like it or not.. ;)

regards
~david