Preserving copyright info

JS minifiers need a `/*!` in the opening of the comment block to ensure the copyright is not stripped out upon minification by tools supporting the pattern.
Merge pull request #25 from jhabdas/patch-1

Preserving copyright info
Preserve comments on build.
Add bower.json file.
Update ignore files on bower.json file.
Remove handlebars.js as a dependency.
Bump version.
Register helpers with Ember.js if present.
Add handlebars as a dependency in bower file.
Add 'build:test' task.
v0.30 Release:
- Register helpers on local Handlebars instances.
- Use Ember.Handlebars.helper to successfully register helpers if using Ember.
lookup localHandlebars instance before looking for global instance.
Improvements:
- Better error handling.
- Passing functions as context in templates will use the value returned.
Use undefined and null for comparisons and conditionals. fixes #29.
Enhancements to {{partial}} helper (closes #30):
- Add AMD support.
- Pass the template in the helper for when theres no commonJS or AMD support.
Add .DS_Store
Update README
Fix for partial helper if you are passing the template.
Bump version to 0.5.0
Update handlebars version in bower.json file. Closes #33