Return valid JSON

The getMetaData function did not return valid JSON, if you ran the
retuned string with `JSON.parse()` it would fail. Valid JSON uses double
qoutes.
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Partial prefix bug fix
Updated README with new helper paths
Merge pull request #159 from adambiggs/master

Fix bug with multiple partials in a template
Merge pull request #158 from pppdns/patch-1

Updated README with new helper paths
Merge pull request #154 from xdamman/fix/tests

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Merge pull request #153 from Saturate/master

Make getMetaData return valid JSON
Bump the version
Bump the handlebars dependency and the r.js one as well