added a check for 'null' before attempting to traverse 'children' property on DisplayObject

remove some lingering events from interaction manager

Merge branch 'dev' into interaction-pointer-fixes

cleanup some export defaults

Huge refactor to match a new shiny eslint file.

Fix readonly errors when normalizing touch events on ios

Fixes to have pointer events work with the new eventData class

merge #2828

Adding support for pointer events (#2997) ...

* Adding support for pointer events

* eslint fix

* more eslint

* And again, really need an npm command somewhere to do the auto eslint fix with the correct spacings

* eslint take #12

Prefer const (#3002) ...

* added prefer-const rule to .eslintrc

* eslint const autofixes

* manual let to const changes; lint free;

* added brace style 'allman' to eslintrc

* brace style, comment fixes and default arg

* brace style fixes

* more brace styles

* Point default args

* Point brace styles

* Observable Point default args

* more brace styles

* jsdoc comment style

* brace style

* brace styles and small jsdoc fix

* brace styles

* removed unneeded eslint inline comment

* brace styles; lint free

add InteractionEvent class. assigning event's target/currentTarget.

Merge pull request #2996 from themoonrat/interaction-mouseover-fix-es6 ...

Fixes mouseover behaviour

Manually merge #2929

Fixes mouseover behaviour

some more es6 changes (#2969) ...

* some more es6 changes
- const instead of let if possible
- arrow functions
- string templates
- argument defaults

* object property shorthand

* some more es6 changes
- const instead of let if possible
- arrow functions
- string templates
- argument defaults

* Revert "Merge branch 'dev-es6-sb' of github.com:stbaer/pixi.js into dev-es6-sb"

This reverts commit 8d3af81, reversing
changes made to e8b9948.

* Revert "Merge branch 'dev-es6' into dev-es6-sb"

This reverts commit 3eeaf79, reversing
changes made to fb69536.

* Revert "Revert "Merge branch 'dev-es6-sb' of github.com:stbaer/pixi.js into dev-es6-sb""

This reverts commit c860228.

* fix RenderTexture, incomplete merge

* fix for text font properties

* reverted some changes

* checked out License, Readme and Contributinf from dev-es6

* editorconfig updated: 2 spaces for .eslintrc

* added eslint rule: spaces around fat arrow

* used eslint fix for consistent spaces around fat arrow

* don't allow scale.x or scale.y to be 0 in displayObject setTransform

* removed jshint comments (again)

Small updates to fix some es6 conversion issues ...

- Removed some require references that were preventing mixins like
interaction from working.
- Fixed Text

Replaces jshint with eslint, using babel in loose mode

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

added clarification to interactiontarget.hitArea (#2835)

InteractionManager event documentation (#2821) ...

* InteractionManager event documentation

* line lenth fix

fixes #2711

Global interaction events (#2658) ...

* Added touch & mouse events to InteractionManager.

* Remove whitespace only lines.

* Corrected issues with InteractionManager's global events.

Docs update (#2651) ...

* Epic run through the docs

* Fixed merge issue

* PIXI.utils now outputs its documentation correctly

pixijs#2541 resolution means pixel ratio too

[IE] if interactionDOMElement.getBoundingClientRect doesn't exist use empty rect

Merge remote-tracking branch 'upstream/dev' into jsdoc-fixes ...

Conflicts:
	src/core/text/Text.js

Allow the JSDocs within DisplayObject to show that it can mix in these interactiveTarget properties

Fixed build error.