Merge pull request #2 from tud27837/ZackBranch

Created high, low, normal, and reverse gravity switches.
lava & glass

Added lava block and a glass ceiling, also made a normal gravity switch
so we can get back down from reversing the gravity.
Merge pull request #3 from ebullock/EricBranch

lava & glass
Cloned master
Adding private.properties to gitignore
Merge pull request #5 from tud27837/master

Update