Add drawing API support

The upstream library actually did not change. This pull request updates requirejs definition only.

The reason for that that "RGraph Drawing API" dependencies were not added into the original requirejs. This patch fixes the problem.

It also removes "rgraph-common" definition, which was never present in the package and would not work anyway.

This is the link to Drawing API:
http://www.rgraph.net/docs/drawing-api-intro.html