Revert "Add PartialFile class to verify valid partial names within sync view folders."

This reverts commit afedde5b383d6e1bd5464fd65a3c9e073a77f4e5.
Use Ruby directory globbing to get list of partial names.

This more efficiently fixes #2 by

* Reducing iterations through files by only looping through files that match format of a partial.
* Reduce object allocations by not having to create PartialFile objects as well as a Partial object for each partial in the directory, additionally not having to create arrays and additional strings for validations.
* Reduce method invocations by not having to validate conditions, and call multiple string / array functions.
Merge branch 'partial_file' of git://github.com/stevestmartin/sync into stevestmartin-partial_file
Use double quotes to properly interpolate resource name.