Fixes handling of sprite sheet error (#4601)

Removes default loadType from the spritesheetParser load options (#4573) ...

Assuming a loadType of Resource.LOAD_TYPE.IMAGE conflicts with the ability to load an image which can't be loaded via the <image> tag.  This happens in the case of loading a compressed image which should be handled by the XmlHttpRequest file loader as an array buffer type.  In the resource loader, there is already a lookup to determine the load type: https://github.com/englercj/resource-loader/blob/master/src/Resource.js#L126
In the case of a binary image asset, the spritesheetParser's loadType stomps on a dynamic lookup based on filetype.

spritesheet url tests for #3715 (#3781)

support for root-relative path (#3715) (#3723)

Refactors the spritesheet, texture and bitmap font loaders (#3676) ...

* Refactors the spritesheet, texture and bitmap font loaders

* Fixes trailing space

* Addresses feedback in var caching and docs

* Adds unit test for Texture.fromLoader

* Adds new Spritesheet class

* Cleanup spritesheet destroy and imports

* Added baseTexture destroy to Spritesheet

Update to Resource loader v2; fixes #2876

Fixes logic for spritesheet resolution (#3464) ...

* Fixes logic for spritesheet resolution

* Typo

* Fixes default logic

* Added an inline comment about the resolution

small tweak to keep things backwards compatible (#3297)

adds support for scale field in spritesheets

Fixes issue #2932 trimmed spritesheet (#3191)

Huge refactor to match a new shiny eslint file.

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

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)

Update imports and exports, getters and setters

Disallow the use of `var`

Dev2 (#2803) ...

* fastRect problem, again

* remove async dependency

Handling data url's in Spritsheets ...

* Handling data url's in Spritsheets

* Fixing dataurl truthy check, removing unnecessary route variable, and fixing brace styles

crop -> orig rename

big jshint tidy

Merge branch 'dev-v4.0.0' into dev ...

# Conflicts:
#	bin/pixi.js
#	bin/pixi.js.map
#	bin/pixi.min.js
#	bin/pixi.min.js.map

Do not create a sprite sheet if the image resources already exists from a previous load; this can happen as a result of calling loader.reset() after a spritesheet JSON resources has been added to the queue but before the corresponding image resource has been added by the spritesheet parser.

Only use spritesheet batching and timeouts for resources larger than one batch size

Change spritesheet parser to enable batching

fix resolution problems

texture rotations ...

frame/crop/trim refactoring
resolution refactoring

Merge remote-tracking branch 'upstream/dev' into dev-rotateTexture ...

Conflicts:
	bin/pixi.js
	bin/pixi.js.map
	bin/pixi.min.js
	bin/pixi.min.js.map

Changes for pixi-compressed-textures ...

1) newer version of resource-loader
2) pass the metadata to images
3) export WebGLManager

+ GroupD8 math module ...

+ texture rotations
+ fix bug in Sprite that causes changes in worldTransform every render

Depecrate `PIXI.math` namespace ...

Access math members from PIXI when outside of core, require the math module directly when inside of core.

typo in comment