Expect CoffeeScript literal syntax in links to class and instance methods

This PR updates the notation for class and instance methods in both generated output and within `{}` links.

Class methods are now indicated with `.` instead of `@`: `Foo.bar`
Instance methods are now indicated with `::` instead of `.`: `Baz::qux`

@gjtorikian Would you mind reviewing this in case I've missed anything. The tests pass and the docs *seem* to be generating correctly.

Closes #18