Update color picker for jQuery 1.9.x

[mattwiebe]

Iris and wpColorPicker relied on the removed $.browser. Iris now does its own detection (sadly still browser sniffing, but manually now). It introduces $.support.iris so that our bundled color picker can just ask for that instead of doing its own sniffing.

Iris 1.0.3 includes numerous bugfixes/enhancements:

• add $.support.iris and remove references to $.browser
• work with * {box-sizing: border-box}
• add a direct color get/set method
• allow all options to be dynamically set after Iris has been created

[ocean90]

Tested in IE7, IE8, Chrome and Opera.

[nacin]

In 23443:

Update the Iris color picker to version 1.0.3, which stops using the deprecated jQuery.browser property.

props mattwiebe.
fixes #23484.