Making this package an Express 4 Router

[colthreepv]

Hello @arthurtsang, I'm making this PR mostly to thank you for this awesome fork and inspiration.

I made this fork into an Express Router, so people can mount it in their development server on an arbitrary endpoint (ex: localhost:8080/edit-raml)

I'm making this PR and a full repository dedicated to it, since I think could use way more documentation.

[justjacksonn]

Hi,

I would like to grab your changes but also see about updating the raml-api-designer to the latest. There is a fresh UI for the side-bar generated documentation that would be nice to see in the designer.

[colthreepv]

I appreciate your feedback, but I'm doubtful this outdated PR is still working.
Since i published it, I had to make a full-fledged rework of your work to make it work smoothly...

Just double-check it in case you are interested in merging, and ping me here to fix it

[arthurtsang]

hi @MrGamer , sorry, somehow the notification is buried in my tons of notification (from other repo that i followed) and thanks for your PR, i'd apprepricate the update. Thanks.