move premade loader to main export

fix some bugs in the loader

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

fix loading of bitmap font

get relative bitmap font loading properly.

better detection of bitmap font; should be relative to xml url now

loader already passes baseUrl, don't need to do it in add

export a premade loader

More docs again !

Docs fixes, improved the consistency of the deprecation, thanks @englercj ...

Also added a comment on the bitmap font parser, will leave the change
until we find a new caching system

fixed typo in cacheAsBitmap, fixed bitmap text and restored the font cache so we can debug it

Merge branch 'alvin/dev' into dev ...

Conflicts:
	src/interaction/interactiveTarget.js

Docs, spine and tiling sprite fixes, another deprecation warning

fix logic error in bitmapFontParser check:

massive jsdoc fixes

fixed typo in loaders/index.js; gulp build wasn't working because of this

some code linting.. ...

nice and tidy!

removed sneaky console.log

tweaked texture resolution for webGL ...

still needs fixing for Canvas

Added loaded images / frames to global cache

update loader; use blob parser

Rotated Textures now working in webGL

bump resource-loader version and use add

update to latest loader

initial texture rotation support

add loaders and spine exports; fix typos in loader; add async dep

remove animcache and framecache from lib

add resource-loader as a dep

Add parsers to loader; remove unused import

implement bitmapFont and spineAtlas parsers