Adds new walk audio
Merge branch 'master' of https://github.com/periodic/LD30
Updates portal sprites.
Adds new level: LongWalk
light and dark map 4
Adds walking test map.
Adds Map4 to the scenes and fixes backgrounds in LongWalk.
Merge branch 'master' of github.com:periodic/LD30
Hooks up map 4 to the game flow
Fixes trigger4 on Dark Map 3.
Merge remote-tracking branch 'origin/master'

Conflicts:
	scenes.js
Merge remote-tracking branch 'origin/master'

Conflicts:
	scenes.js
Sync from GitHub
Updates the README to add info on the Hole type.
Fixes portal rendering.
Some progress on fades.
Fixes paths in LongWalk.
Portal animations

Title says it all.
Fixes fades.
Adds world fading.