* Color.cs: To match MS.NET, throw ArgumentException instead of

* Color.cs: To match MS.NET, throw ArgumentException instead of
ArgumentOutOfRangeException when color is not between 0 and 255.
* RectangleConverter.cs: Take culture into account when converting
to/from string. Use culture's ListSeparator as separator character.
* ColorConverter.cs: Mono now also throws ArgumentException when
color value is not between 0 and 255.
* TestColor.cs: Added tests for invalid color values.
* TestRectangleConverter.cs: Fixed tests for conversion to/from
string. Added tests that verify results using specific cultures.

svn path=/trunk/mcs/; revision=48426