Changes charge scale
Regexp for hn self-posts
Enables back button through #category urls
Clamps radius scale so we don't end up with negative values on transitions
Adds hyperlink in tooltip
Messing with gravity constants
Moves remove transition in callback, fixes bug where bubbles would not
disapear when api is slow.
Adds credits to Jim Vallandingham
Merge pull request #3 from ricardmo/change-transition

Change transition