GitHub push 3-27-14

[Additions]
- Improved level difficulty script so it controls caution signs and
game obstacles better.
- Added new obstacle, boundary collapse, where the top and bottom of
the screen push in.
- Working on power up system now
- Added swiping to input system. Sends an event out whenever the user
has swiped.
- Partially have swipe to remove nodes in place. Swipe effect appears
on screen to show visibly where the player swiped. Now have to keep
track of what nodes are hit (a ray shot from start to finish) and then
remove them.

[Note]
- Need to make row texture a vertex lit which means I have to include
the color on the texture. This will improve performance of game.