Merge pull request #5 from JGK1213/brian

Minor speed changes
changed assets to 75 percent, added into preload, Brian added some css and changed main.js
Merge pull request #6 from JGK1213/jackie

changed assets to 75 percent, added into preload, Brian added some css a...
added new obstacle
Merge pull request #7 from JGK1213/jackie

added new obstacle
readjusted times, sizes, positions of items in regards to downsizing canvas size