Added jQuery Api Files

Added the Javascript file and the CSS file required taken from:

http://code.jquery.com/qunit/qunit-1.12.0.js
http://code.jquery.com/qunit/qunit-1.12.0.css
Added jQuery Api Files

Added the Javascript file and the CSS file required taken from:

http://code.jquery.com/qunit/qunit-1.12.0.js
http://code.jquery.com/qunit/qunit-1.12.0.css
added tests.js file where you can place test cases. Added a QUnit testing page to display the results of the tests ran in the tests.js file
Merge branch 'issue9' of https://github.com/maronin/DOM-diff into issue9
added some assertion test case examples
fixed some typos
added new line characters at the end of the files
Merge pull request #13 from maronin/issue9

Issue9 (Create a QUnit test framework)
Merge branch 'treebased' of github.com:Pomax/DOM-diff into issue12