Spelling

Fixed spelling
Merge pull request #55 from wulftone/patch-1

comment spelling fix
More spelling :)
Merge pull request #56 from wulftone/patch-2

More spelling corrections
change wrap function into template
added test for r.js optimization
possible fix for #59. added new UMD pattern
added basic node.js loading test
ensure node.js loading works
fix issue #62. don't allow duplicates to be added to world. added has() method
Merge branch 'issue/59'
fix issue #31. HTMLElements are removed from dom as bodies are removed from world.
Little correction

It should be this way, shouldn't it?
Merge pull request #67 from wm1sr/master

Correction to comments involving Vector.perp(). Direction was wrong
fix: issue #68
smaller umd wrap
jshint fix
add jshint to dev test
small fix to umd
release 0.5.4