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 #779 Adding the new AT flat skin

New flat skin for aria templates

Close #779