WS
Add tests
Rename custom_concat_usemin test to custom_usemin
Default usemin to null
Refactor normalization to only add to .js targets

Fixes #44
Remove .js concat target restrictioni from
0d8ed0d52b9f648fc2ed7706bcc6f060deb213eb
Abstract out concat code
Update concat_usemin test
Add optional filter to appendToConcatTarget
Remove unecessary target
Add support for usemin option
Remove unnecessary dependencies
Clean up code
Update grunt-usemin example
Bump to v0.4.10
Merge branch '0.4'

Conflicts:
	README.md
	package.json
	tasks/angular-templates.js
	test/angular-templates_test.js
	test/expected/usemin.html
	test/expected/usemin/foo.js
	test/fixtures/usemin.html
Bump to v0.5.1