Coercion refactoring, WIP.
Code cleanup, hoist some functions out of the builder.
Use |toNumber| instead of |Number()|.
Cache numeric comparators.
Some test cases.
Merge pull request #569 from mbebenita/runtime

Misc refactoring, perf updates.
Mark used method parameters.
improves inspector

- docked panels
- support for retina in terminal
- better tabindex/focus handling
Merge pull request #576 from claus/inspector

Inspector improvements
shows message in top toolbar
prevents toolbar buttons to wrap
centers stage
removes focus outline
Merge pull request #577 from claus/inspector

Inspector: minor improvements and bugfixes
Increase frame rate to 30 fps for timeline scene and glowfilter tests
Merge pull request #572 from mbebenita/runtime

Mark used method parameters.
Keep invisible objects out of the quad tree.
Merge pull request #578 from tobeytailor/rendering

Don't keep invisible or out-of-view objects in the quad tree
Only destroy already constructed display objects.
Merge pull request #579 from tobeytailor/timeline

Only destroy already constructed display objects.