Clean up unused branches

[samreid]

From code review #177, can we clean up any of these branches?

[jonathanolson]

@jessegreenberg, do we still need the websocket/nexus branches?

@kathy-phet it looks like Michael Dubson did some ruler-picker visual updates, should we look into whether to integrate it, leave the branch, or potentially delete it?

[jessegreenberg]

No, the websocket and nexus branches can be deleted at this time. Thanks!

[jonathanolson]

Websocket and nexus branches are deleted, thanks!