add tests for Jetpack::Settings
change default ruby from 1.8 to 1.9
allow arbitrary keys in config
Merge pull request #31 from square/arbitrary-settings

Arbitrary settings
omg don't do bundler's job
make rake not blow up
remove gem.path from jetty config
make settings a little more terse
add backwards compatibility
Merge pull request #30 from square/omg-dont-do-bundlers-job

omg don't do bundler's job
Merge remote-tracking branch 'upstream/master'