Add one more test for StringDerivedProperty.
Merge commit 'b5da45ab81ed33a0c4628d25c18dadb39389f7bd'
Fix issue #125. Add JUnit to clarify issue #128. Add Junit for issue #123.
Add junit for issue #109.
Javadoc updated for Issue #126
Merge pull request #131 from allenxwang/master

Fix issue #125. Add JUnit to clarify issue #128. Add Junit for issue #123 and issue #109.