Replace broken jquery.tablesorter.min.js to latest (2.17.3)

We're having issue on Storm 0.9.2-incubating, javascript error from Storm UI.
(It's already issued : STORM-379)

It's syntax error from jquery.tablesorter.min.js,
I'm not familiar with javascript, so I've just replaced it to latest version (2.17.3), and it works!

I don't have strong reason to use latest version, just resolve problem.
So reviewers have a reason or issue to not use latest version, surely it can be changed.

I'll make pull request to continue working on it.