* renaming accessors
* changing the default to disallow external resources
* introduced system-property for backwards compatibility
* honor system-property (if present) and SVGReadParams.isAllowExternalResources hasn't been called
(as against ignoring system-property and reverting to 'block-by-default' if SVGReadParams.isAllowExternalResources invoked)
* added + updated test cases
- Removed JMock dependency, tests rewritten to use Mockito for stub/mock
- All test should now be using JUnit annotation-style tests
- All modules should now depend on same JUnit version
- Rewrote a few tests to better utilize JUnit annotations
- Fixed a few broken tests
- Code style changes
