upgrade JDK from 1.6 to 1.7
add tests case to improve coverage.
Merge pull request #20 from eller86/improve-coverage

Improve coverage
Merge pull request #21 from eller86/11-add-reported-attribute

add `reports` attribute to findbugs.xml.
Merge remote-tracking branch 'worksap/master' into visible-for-testing

Conflicts:
	README.md