Update draw2d to be used via Github

[odannyc]

dep ensure is currently failing on anything that depends on this package gogeos because of this error:

init failed: unable to solve the dependency graph: Solving failure: No versions of github.com/paulsmith/gogeos met constraints:
	v0.1.2: unable to deduce repository and source type for "code.google.com/p/draw2d/draw2d": unable to read metadata: go-import metadata not found
	v0.1.1: unable to deduce repository and source type for "code.google.com/p/draw2d/draw2d": unable to read metadata: go-import metadata not found
	v0.1.0: unable to deduce repository and source type for "code.google.com/p/draw2d/draw2d": unable to read metadata: go-import metadata not found
	master: unable to deduce repository and source type for "code.google.com/p/draw2d/draw2d": unable to read metadata: go-import metadata not found

[jpopadak]

Any update on this @paulsmith ?