Add splitter directive based on [Blackgate Splitter](https://github.com/blackgate/bg-splitter)
 - Bring in to Typescript for great justice.  TODO: Clean up for reuse.
Cleanup
LESS pass on fileTree styles.  Conclusion: Yikes.
Move node-webkit data into root package.json file.   Is this a horrible idea?
feat(Pixi): add basic pixi js integration for rendering tilemaps

- Selecting package.json in the file tree will display a pixi content view with a scrolling texture.
- add <pixi> directive to encapsulate pixi editor view.
chore(NodeWebkitBuilder): add grunt node webkit task for building standalone

- Verified it works on OSX, should test/confirm outputs for Linux/Windows.