Fix doc bug; cleanup ternary syntax

- Fixes a documentation bug that gave incorrect default paths for `Crafty.load`
- Changed style of ternary operator usage, hopefully improving code clarity
Fix whitespace error in tests/core.js
Merge pull request #831 from starwed/load-fixing

Fix doc bug; cleanup ternary syntax in loader.js
Implement a new strategy for avoiding event queue mutation

The event callback queue can mutate in ways that mess up the iteration.  There are two cases we need to handle:
- While iterating through an event's callbacks, a new one is added.  This should not be triggered.
- When a callback is removed, we shouldn't actually mutate the callbacks array if this iteration was triggered in the middle of an iteration over the same array.

The first is solved by registering the callback array's length at the time iteration starts.  The second is solved by adding a depth counter to each callback array.  It's iterated at the beginning of iteration, and decremented at the end.  Items are removed from the callbacks array only when the counter indicates a depth of 1.

This patch adds a test for the addition of a callback mid-event.  It also adds one for binding/triggering groups of entities at once, since I noticed a typo I introduced while modifying the code wasn't being caught by the existing tests.
Merge pull request #832 from craftyjs/event-loop-fix

Implement a new strategy for avoiding event queue mutation
Release 0.6.3 of Crafty

Change name to craftyjs because crafty is already taken on NPM
If window is not defined
Implement a webgl backend

This implements a new rendering method; using webgl to draw to a canvas.

For Crafty's built-in components, simply replacing Canvas or DOM with WebGL will enable and draw to a webgl context.

It attempts to be somewhat flexible, but is designed specifically for drawing rectangular regions.  Custom shaders could be provided by a user.

For more information on the implementation, see comments in the code and this [page on crafty's github wiki](https://github.com/craftyjs/Crafty/wiki/WebGL-implementation).
Add brfs for inlining files
Implement webgl rendering for Color component
Implement webgl rendering for sprites
Implement webgl rendering for Image components