Merge pull request #2 from johnmangan/master

Including unistd.h
AP Windows compile
* fixes to compile core under windows
Merge branch 'apdev' of vis2.calit2.net:/git/calvr
AP Header fix
Merge branch 'master' of github.com:CalVR/calvr
AP Installable, general libusb server, etc
* CalVR is now installable and can be built out of tree, note: the api now separates home,config,resource,plugin directories
*     rather than assuming they are in home.  see wiki for more info
* added general purpose libusb vrpn server
* added navigation mode that uses valuators
* added event debug printouts
AP Windows fixes
AP Dwall config checkin
AP config update
AP dwall config cleanup
Merge branch 'master' of vis2.calit2.net:/git/calvr
AP Navigation
* snap added to valuator nav mode
* snap initial state now pulled from config file
AP starcave config cleanup
Merge branch 'master' of vis2.calit2.net:/git/calvr
AP nexcave config cleanup
AP tourcave config cleanup
Merge branch 'master' of vis2.calit2.net:/git/calvr
AP Cluster init output
* adding better head node output during a cluster startup failure, WIP
Merge branch 'apdev' of vis2.calit2.net:/git/calvr
AP Cluster init output
* modifications after cluster testing