Editing pass on History.md
observe changes tests no longer leak observe handles
Don't leak a LiveResultsSet on erroneous recursive observe.
Stop keeping around so many subscriptions when we are done testing
Remove unused requires from app and unused mime module from dev bundle.

I'm not bothering to increment and build the dev bundle; fine with this just
getting rolled into whatever the next build is.
Fix EJSON.equals and EJSON.clone to use better loops; be more correct
new dev bundle, updating mongodb driver (and removing mime)
Remove no-longer-necessary mongodb data cleanup.
Tell Future.wrap where the callback is (signature changed).
also upgrade underscore to 1.4.4 while we're at it
upgrade package underscore too
history.md for version bump
dev_bundle 0.2.22: mongodb and underscore upgrade.
Merge branch 'devel' into deps-radical

Conflicts:
	packages/test-in-browser/driver.js