clarify that "build & test everything" Grunt task requires Jekyll

Refs #13131.
Removed double parentheses from expressions
Merge pull request #14836 from lipis/double

Removed double parentheses from expressions
Add min-height: 0% to .table-responsive; Fixes #14837
Don't fire show event if show is prevented because other element is still transitioning

Fixes #14844.
Closes #14845.
grunt
Merge pull request #14838 from twbs/ie9-bizarre-table-hover-bug

Add min-height: 0% to .table-responsive; fixes #14837
Replace the unicode ellipsis symbol with 3 dots.

[ci skip]
Update JSZip to v2.4.0.

[ci skip]
Update Holder.js to v2.4.1.

[ci skip]
Run `grunt`.

[ci skip]