Made graph_groups(map, routes, brks)

Made graph_groups(map, routes, brks).  It'll draw the given routes
according to the given brks.

But it's still not finished yet. For now it's adding hardcoded DC into
the first element of each path, and haven't made the deleting/updating
function yet.
Merge branch 'master' of https://github.com/rohams/capstone