Bumped version number to 0.8.0-SNAPSHOT
arrows now connect their base to the code of the node per #55
Merge branch 'develop' of https://github.com/almende/vis into develop

Conflicts:
	dist/vis.js
	dist/vis.min.js
fixed color bug per #54, fixed on('select') bug per #58
fixed label color bug per #54
Clarified docs, stressing the css file is required to use the navigation and manipulation features of graph. (#55)
clarified variable names, removed magic number from discreteSteps
fixed positioning bug, positioning doesnt need manipulation hack anymore.
improved Playing with physics
added highlight on keypress per #62
reverted arrow spawn from center to edge due to labels disappearing behind nodes #49
updated history
Released version 0.7.1