Fix #3199 by honoring alpha (#3943) ...

* fix #3199 by honoring alpha

* use old algorithm for noise color adjustment

* add ctor args for uniforms

* Add jsdocs for ctor args

Improved documentation ...

Class member documentation improved via removal of unnecessary @memberofs - more members now show up in the docs.
Class getter/setter documentation improved using technique above, and also by removing documentation for setters. Documentation was only showing the setter docs, whereas the getter is where the important information is. JSDoc maintainers themselves recommend just doccing the getter jsdoc3/jsdoc#973
Documented a few classes to let devs know that they are automatically created by PIXI and added to renderer.plugins, like interactionManager and prepare

Removes glslify

Huge refactor to match a new shiny eslint file.

Update imports and exports, getters and setters

Disallow the use of `var`

Implementing classes using the new ES6 syntax (#2936) ...

* Migration to ES6 classes

* Migration to ES6 classes

* Migration to ES6 classes

* Migration to ES6 classes

* Using babelify to transpile ES6 code

* Adding babel-preset-es2015 in devDependencies

filter tidy up..

added gray filter move old filters

Massive documentation update; fixes many issues. ...

Issues fixed by these documentation updates:

- #1973, fixed filter and BitmapText property docs
- #1908, fixed type reference links
- #1856, fixed name of MeshShader

Fix a display bug on iOS

fixed extends doc issue

Reference issue for all fs requires (fixes typo as well)

Move require('fs') out of the constructor to the top.

massive jsdoc fixes

convert more filters