Mini Fixes

Fixed webGL Blend mode issue
Fixed render texture alpha issue
Fixed Canvas tinting issue
Fixes .visible on SpriteBatch using Canvas

Prevents SpriteBatch from rendering in Canvas mode when visible is false.
Merge pull request #948 from smvilar/patch-2

Fixes .visible on SpriteBatch using Canvas
Fixed minY calculation in updateBounds

Thanks to @6220119 for spotting this. Issue #952
First Retina pass

Sprites / Graphics / Text
Fixes #953
Added Resolution property to items

Interactive Manager
BaseTexture
Text
WebGLRenderer
Made sure default resolutions are all 1
Whoops.. double quotes
Added some new Matrix functions..
Added Canvas Renderer resolution
renderer now uses options parameter
fixed typo in comment
Update SpriteBatch as is somehow became old..
doc update for detector
webGL renderer tidy
republished files
Tweaked interaction manager to include resolution
documented resolution in webGL renderer
Merge pull request #957 from rex64/patch-1

fixed typo in comment