Remove grunt dependency

[rstacruz]

Addresses #25.

This also removes the confusing duplicate of src/ractive-adaptors-backbone.js and /ractive-adaptors-backbone.js -- some people send PRs to one but not the other.

• Removes all grunt-related things. The only functions grunt fulfilled was jshint and uglifyjs compression.
• Implement jshint checking via npm test.
• Implement uglifyjs compression via npm run prepublish.
• Removes src/.

[rstacruz]

Oh, the con is that we'll need to bump the version in the js file manually now. Not much of a problem, considering we need to bump {bower,component,package}.json manually anyway :) (tip)