Rename component.json -> bower.json to follow new conventions.

See Bower's documentation:

> You must create a bower.json in your project's root, and specify all of its dependencies. This is similar to Node's package.json, or Ruby's Gemfile, and is useful for locking down a project's dependencies.

> NOTE: In versions of Bower before 0.9.0 the package metadata file was called component.json rather than bower.json. This has changed to avoid a name clash with another tool. You can still use component.json for now but it is deprecated and the automatic fallback is likely to be removed in an upcoming release.