update socket.io version to fix compatibility with node 0.10
remove splits memoizing

this makes memory leaks involving models worse and the performance
gains aren't probably worth it at this point
simplify how operations create transactions
remove extraneous tests file
refactor in-memory PubSub to expose memory leaks
fix memory leak in applyTxnToDoc
refactor reconnect code to better encapsulate in named objects
remove unsued code
Merge branch 'master' of https://github.com/codeparty/racer
Fix major memory leak caused by unsubscribe argument not of correct type
Merge branch 'master' of git://github.com/codeparty/racer

Includes lots of Racer perf work from codeparty
Conflicts:
	lib/Model.js