feat #785 Updating Splitter widget skinnable properties

Adding border-radius and background-color.

Close #785
fix #754 make TemplateContext.getDomId private

Close #793.
feat #786 Updating the skinnable properties of Icon widget

Making the background-size, background-color, border and border-radius available through the skin

Close #786
fix #746 test.aria.widgets.issue746.SkinClassFallbackTestCase

test.aria.widgets.issue746.SkinClassFallbackTestCase now passes both
in packaged and unpackaged modes. In unpackaged mode, it now tests the
right thing.
feat #790 Updating the computeSize method in order to consider borders

Updating the computeSize method in order to consider borders and margins.

Close #790
feat #781 CSS Gauge progress bar

Adding the css to be used to make the gauge progress bar instead of using images and sprites.

Close #781
feat #786 Adding skinnable properties for the icon

Close #786
fix #780 Removing overflow property from Select Widget style

Removing the overflow:hidden property from the CSS template of Select widget
feat #779 Adding the new AT flat skin

New flat skin for aria templates

Close #779
fix #746 Removed usage of map function to fix SkinClassFallbackTestCase for IE 7/8

Close #798
v1.4.12
fix #801 Wrong validation on the textinput widget

If a textinput widget, with directOnBlurValidation set to false, has an error state, focusing and bluring the field removed the error state, which is wrong as no changes occurred