Remove "strip for ie7" code from JavaScript

[cvrebert]

There are several instances of this code snippet (or similar) in Bootstrap's JavaScript:

selector = selector && selector.replace(/.*(?=#[^\s]*$)/, '') // strip for ie7

Since Bootstrap v3 no longer supports IE7, we should remove this code to simplify things and improve performance.

[cnanney]

From the documentation:

Unofficially, Bootstrap should look and behave well enough in Chromium and Chrome for Linux, Firefox for Linux, and Internet Explorer 7, though they are not officially supported.

Is it worth it to kill these components in IE7 for very minimal gains? Removing cumbersome IE7 CSS hacks is one thing, but to arbitrarily break components is another.

[fat]

yeah we aren't going to get any tangible perf gain from removing 1 tiny regexp… especially since that regexp is tied directly to events

I think we should leave it for now… doesn't hurt anything