Update quintus_sprites.js

When centring a sprite inside a container, the x,y coordinates should be set in sprite coordinates (0,0) rather then those of parent (p.w/2,p.h/2).

For a quick test run:

Q.scene('test',function(stage) {
	var one = stage.insert(new Q.Sprite({x:100, y:100, color:'red',w:200,h:200}));
	var two = stage.insert(new Q.Sprite({color:'blue',w:100,h:100}),one);
	two.center();
});
Q.stageScene('test');

As is right now turning two.center(); off will result in the correct behaviour.
Transparent sprite performance improvement

This skips rendering complete transparent sprites. Bit faster.
Fix Mouse position in canvas with margins or padding

The mouse position in an element is measured from the top left corner. When a margin or padding is used this starts outside the drawable area of the canvas. This needs to be taken into account.
Fix Touch position in canvas with margins or padding

The mouse position in an element is measured from the top left corner. When a margin or padding is used this starts outside the drawable area of the canvas. This needs to be taken into account.
Fix for UI.Text allign

align is used to both set the alignment in the front string and to physically move the location where the font string is to be. The end result is that align is always centered.

This fixes this by making the default alignment centred and removing the physical positioning of the text.Bounding points are adjusted accordingly.
Fixed typo in fix

Fixed typo in fix
Restructure added redundancy
Restructure added redundancy
Merge pull request #117 from Bitshock/master

Few nice fixes. Looks good and interesting
Merge pull request #119 from mpkorstanje/patch-2

Avoid rendering transparent sprites
Merge pull request #107 from mpkorstanje/patch-1

Fix for Q.Sprite.center()
Update quintus_ui.js

Fixed cx/cy coordinates
Alligned text to top
Made line-height an explicit property
Added in half-leading
Update quintus_ui.js
Update quintus_ui.js
Update quintus_ui.js
Update quintus_ui.js
Update quintus_ui.js
Update quintus_ui.js
Update quintus_ui.js
Merge pull request #122 from mpkorstanje/patch-5

Fix for UI.Text align