Using ruby-version and ruby-gemset files

For Ruby Version Managers.
Made the default rake task run the tests

More commonly known to be run this way. Added Rake to the Gemfile for
this too.
Incorrect New Relic license key reference

NEW_RELIC_LICENSE_KEY is the config file and NEW_RELIC_ID here
Ignore log/
Updated for default rake test
Merge pull request #36 from eksoverzero/master

Various fixes