Fix views namespacing errors

[edshadi]

If we try to namespace our views (e.g. posts/new.hbs), grunt will throw an error

Cannot find module '..../app/views/posts' Use --force to continue.

This is happening in the browserify grunt task where the src pattern is set to '*/'. This commit specifies the src file patterns that we're interested in, namely: .hbs and .js.