fixed rounded rectangle issue

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

Fixed resolution issue with canvas renderer

restore default blendMode when drawing filter

fixes #1547 - negative viewport values for off screen

fixed multiple alpha mask issue fixes #1571

Merge remote-tracking branch 'origin/dev' into dev

Fixed render texture bug

fixed retrieve Canvas from RenderTexture bug

Merge pull request #1556 from clementchenebault/dev ...

add some space in the “sayHello” console.log

add some space in the “sayHello” console.log ...

Add some padding and some ✰ stars ✰

use core.utils ref

extend -> object-assign

render methods are private

minor doc cleanup

fix some typos and jshint issues

mess with exports a bit

fix a couple minor argument deopts

optimize the rounded rectangle point array creation

reuse the same array objects on reset

remove an unecessary todo

make bg defaults all black

no need to check bg option twice

fixed generate texture for Graphics

pass clear property to renderDisplayObject function

make default bg color black

fixed getBounds on Sprite ...

sprite getBounds now takes sprites children into account

Texture.fromVideo should allow urls like other from* methods

remove some lingering .bind()s that are no longer needed

missed on, and use once