Update config.guess and config.sub, to fix x86_64 compile issues with OS X
Add gitignores for more files, including several of our internal libraries
Add some more to gitignores, change OS X StandardAlerts to UserNotificationDisplay (which are newer and work from 10.0+)
Merge pull request #33 from DanielOaks/mac-osx-building

Mac OS X building, updating useful script and gitignores!
Update gitignores
Fix SDLOTHERLIBS order, make error handling better in SDL init
Fixup windows build