migrate test to use rake::test

This allows easier standardization for includes (allowing the test folder to be included in the load path) and provides a standard way for running tests that most should be familiar with.
add contributions section to README
Merge pull request #65 from danshultz/run-single-tests

Run single tests
Make it possible to disable the autorun class.

I want to write unit tests for my handlers, and so the autorun kicking off is highly
inconvienient. Make it so that this can be optionally disabled by requiring a handler
and then calling HandlerClass.disable_autorun
Change to false
Merge pull request #61 from bobtfish/be_able_to_remove_autorun

Make it possible to disable the autorun class.