Upgrade to CSS4J 0.37

CSS4J CHANGES
=============

Version 0.37
------------
 * Core:
- Fixed the problem with the Surefire tests. Thanks to Tibor Digana.
- Bug: non-percent border-slice values could be ignored when setting the
  background shorthand.
- Improved handling of invalid border-image shorthands.
- DOM implementation: remove ordered class lists, a misfeature introduced in 
  0.33 that was breaking the matching of some attribute selectors.
- NSAC implementation: fixes for escaped characters. May introduce regressions
  and needs testing.
- Initial support for gradient values.
- Simplify the code for color values by unifying values with and without alpha 
  channel. Add support for HWB color space.
- Support 'currentcolor' in box shorthands.
- Limited support for 'initial' and 'unset' in box shorthands (should be avoided
  there).
- Support non-whitespace separators in class attribute values.
- Add support for margin rules, and a small cleanup in other rules.
- Support functions with structured arguments.
- Numeric primitive values: create immutable numeric values.
- CSSStringValue and CSSURIValue: set the primitive type when using 
  setCssText(), and behave accordingly.
- Major renaming of classes that implement CSSOM-related interfaces and whose 
  names start with DOM, but are not DOM-specific. Now they start with OM.
- Small cleanup in property values.
- DOM implementation: smaller default buffer sizes for element.toString().
- Move a couple text escape methods to ParseHelper, and do a small cleanup of 
  the CSSStringValue hierarchy.
- Move primitive SAC-to-Object-Model methods from AbstractCSSPrimitiveValue to 
  new class ValueFactory.
- Add infrastructure to process value warnings in the style declaration error 
  handler.
- Add W3C copyright notice to some files that missed it.

 * Dom4j module:
- Apply the major class renaming from core.
- Adapt to method name change in core (declaration error handler).

 * Agent module:
- Maven POM: the jar file was missing the resources.
- Lazy instantiation of DefaultOriginPolicy.

 * Visual module (staging):
- Apply the major class renaming from core.
- Include highly experimental classes from staging area.

 * Java2D module:
- Apply the major class renaming from core.
- SampleSitesIT: small Continuous Integration tool.