Add 'active' class to activities
added graph.js to the index.html
added graph.js to gitignore
fixed some null errors with intersect_line_box, and also a click radius on nodes fixes #10
added most snap functions
many things
added some more to snap.d.ts
added bootstrap.d.ts
Fixed explorer edge expansion
tweaked node bending
Structural sharing on restrictions
Made relabelling set immutable
fixes all actions being prefixed as complementary
Restructured activities
separates activity and rendering
Change gutter color