Upgrade to mimosa 0.12.6, ember 1.0.0-rc.5, and handlebars 1.0.0-rc.4
`deferUntilDOMReady` is not defined, and apparently not needed
(otherwise should use App.deferReadiness() and App.advanceReadiness())
Merge pull request #2 from brzpegasus/master

Upgrade versions of ember, handlebars, and minMimosaVersion