Remove HHI folder now that it is embedded in hh_server
Hack is now case-sensitive
?mixed is redudnant
Update XHP lib
Correct some types
Hack fixes

Conflicts:
	php/classes/forms/Form.php
Add missing method
Pull HHVM location from env rather than hardcoding
Parent's constructor is now abstract, so don't call it
Exclude beatbox exceptions from being converted to errors
Couple more hack fixes
Handle async and sync results from form handlers
A point needs to be casted as one on saving
Add support for adding fields to the SELECT clause
LSB all method calls in the router
Fix some typechecker errors
asio classes are now in HH and autoimported
Another ASIO class that has moved
Handle negative values in Geom floats
Allow for multiple application directories