Grid Widget 0.3.2 - PHP examples

New: PHP examples.
Fixed: ID bug in setContent function.
Changed: Active.Formats.String dataToValue converts strings to upper case. This makes sorting case-insensitive.
Changed: null value in the attribute removes it from HTML string.
Changed: special handling for the following attributes:
checked, readonly, disabled, hidefocus - false value is treated as null, i.e. attribute is removed.
New: action calls allow up to 3 additional arguments.