update batchTxn to be a callback instead of object, put batch
operations back in for scoring & cron. hoping this will cut back on
the 4000ms issue, quite an emergency that
batch: add convenience batch.set / batch.get for updating paths simultaneously
Merge branch 'develop' into challenges

Conflicts:
	src/app/index.coffee
merge character.coffee into profile.coffee, remove unecessary requires
Merge branch 'develop' into challenges

Conflicts:
	src/app/misc.coffee
	src/app/party.coffee
guilds: prettier group-creation
challenges: add taskInChallenge() view helper and broken task.challenge link