Fix dependency hash for #multicompile

The branch appears to be called "multicompile" not "mc".  This should fix installation errors like:

  Failed resolving git HEAD (git://github.com/kristianmandrup/ember-script.git) fatal: ambiguous argument 'mc': unknown revision or path not in the working tree.
Merge pull request #1 from mgood/patch-1

Fix dependency hash for #multicompile