Icon not centering in Angular Material

When setting the size of an icon it was not being centered in an element when it should have been (using layout-align="center center"). Setting the icon size to "48" produced an icon with the correct size, but the parent ng-md-icon element still had css properties (height/width) set to 24px.

A potential solution is as follows around line 38:

`// size`
`if (attr.size !== undefined) {`
`size = attr.size;`
`}`

changes to:

`// size`
`if (attr.size !== undefined) {`
`size = attr.size;`
`element.css('height', size + 'px');`
`element.css('width', size + 'px);`
`}`

This inlined the css styles and fixed the issue.

Cheers

Simon