doc tweaks

More Ticker changes (see details) ...

These additional Ticker refactor changes include:
- Separate update() from requesting an animation frame
    - This allows calling update() with a completely separate animation/ticking API if necessary or one chooses
- Complete all TODOs
    - Added const.TARGET_FPMS
    - Added readonly property ticker.FPS
    - Added readwrite property ticker.minFPS
- added polyfilled "performance" to jshint globals
    - removed `global` in usages of it

Move items into their namespace ...

This commit also:

 - fixes some dangling whitespace,
 - fixes some incorrect docs in extras/mesh,
 - moves Text to core
 - moves BitmapText to extras
 - moves math constants to const.js

Filter tweaks ...

added filter resolution
removed unused variable

added forceFXAA to options ...

setting forceFXAA and antialiasing to true will force FXAA antialiasing
instead of native

massive jsdoc fixes

resolution prefix can now be a value other than 2

added resolution property to text

tweaked texture resolution for webGL ...

still needs fixing for Canvas

fix some jsdoc stuff

normalize constants to all be caps

refactor renderers to have a common base

added a Sprite Batch Size constant ...

for those who wanna turn it up to 11..

make texture frame a setter; clear up some typos

reorg webgl utils; move primitives to core; refactor shape types

Lots of core renderer-related updates ...

- Removed `Stage` completely from core lib, in favor of directly rendering
  DisplayObjects
- Removed rendersession from core lib
- Rewrote WebGL managers to be more DRY and have a common base
- Rewrote Shaders to be more DRY and have a common base

fix require paths for browserify

initial move to new module folders