add title to Simulator window (#197)
move Help link to corner and point it at new docs; remove unused nav elements
use override to remove test apps that we can't remove by setting GAIA_APP_SRCDIRS; but stop override-removing feedback.gaiamobile.org, which no longer gets added by default
Merge pull request #469 from mykmelez/tidbits

fix three minor polish issues with low-risk changes