Investigate other javascript diffing libraries

[mupchrch]

Would like to investigate alternatives to jsdiff such as google-diff-match-patch, prettydiff, etc. My hope is a new library would improve performance and/or diff success.

[awillats]

I'd like to request adding wikEd diff (project discussion page, online interface) to the list of javascript diffing libraries to be integrated eventually. It does quite a good job of handling "block moves" in diffs