Moved mocha to devDependencies.
Added support for typedefs with a /*type FooBar = ... */ syntax.

See: http://flowtype.org/docs/type-aliases.html#_
Normalized test case names.
Renamed the "jsToJsx" transform method, as we don't necessarily have anything to do with JSX per se.
Switched from the /*type ... */ syntax to the more generic /*:: ... */.

What the heck, less changes needed later.
Added a quick initial check for the presence of a .flowconfig file, so we can bail out quicker if we're doing something silly in a wrong dir for instance.
Version bump.