fix missing angular-rails-templates -- it wasn't in the gemspec

minor:
- typo
revert pull #39

config.assets.precompile sets up manifest files to be generated by rake assets:precompile. angular-rails-templates.js doesn't need to be compiled into its own file. It just needs to be in the a manifest.
Merge pull request #41 from whitehat101/fix-missing-asset

Fix missing asset