give staff an allocation limit if they don't have one

This is a placeholder until the server side provides staff with an
allocation (just with a really high generally unreachable limit)
fix typoes

https://pods.iplantcollaborative.org/jira/browse/ATMO-620
show CPU and memory quota in instance launch modal
calculate currently used resources for instance launch
add quota information to volume create modal
fix logic error in instance launch modal