Adding resolve-dep to load helpers from node modules

Now minimatch patterns can be used in helpers and they'll
look inside your devDependencies for any node modules that it finds.
If it finds modules, it will attempt to load those as helpers.

Requirements for use:
 - Install the module and save to devDependcies
   - npm install my-custom-helper-module --save-dev
 - Add a pattern or the entire name to use that module in the options
   - `options: { helpers: ['*-helper-module'] } }
 - Enjoy
0.4.6
Merge pull request #304 from doowb/loading-helpers

Adding resolve-dep to load helpers from node modules.