(infra) upgrade centos from 6.4 to 6.5

 - rename the box folder as well for future changes
 - remove the box_modules permissionstest
(maint) ubuntu needs lots of memory to do the same as centos, who knew?
(infra) ubuntu 14.04
(maint) introduce box tweaks to speed up Windows VMs
(win2012) add 2nd private network
(shared) upgrade ruby to latest 1.9.3 / bundler tweak
(chocolatey) set up boxes for smoke testing
(infra) set up windows boxes to simulate memory pressure