Adjust for Scrollspy offset when calculating maxScroll.
Add Scrollspy maxScroll with offset test.
Add tooltip self-reference to address #12320

primarily adds a data- attribute to the tooltip (and thus, the popover)
to create a self-reference.
Adds aria described by to tooltip plugin for accessibility

Generates a unique id for tooltip and adds [aria-describedby] to the element
it is called on. Resolves issue #13480

- set up test
- linted the code styles
- passed the tests
- integrated feedback from @cvrebert
show proper error message when viewing Customizer in IE8

Closes #13090.
[skip sauce]
Merge pull request #13626 from twbs/address-13090

show proper error message when viewing Customizer in IE8
bump glob to ^4.0.0
update shrinkwrap

[skip sauce]
Merge pull request #13667 from twbs/bump-deps

Bump glob to ^4.0.0
bump grunt-saucelabs to ~7.0.0
update shrinkwrap

[skip validator]
Merge pull request #13668 from twbs/bump-sauce

Bump grunt-saucelabs to ~7.0.0
Merge pull request #13557 from bassettsj/aria-describedby-tooltip-13480

Aria describedby tooltip: #13480
Merge pull request #13593 from ResentedHook/master

Add tooltip self-reference to address #12320
Merge pull request #13589 from mrobinet/scrollspy-maxScroll-with-offset

Adjust for Scrollspy offset when calculating maxScroll.
grunt dist
Tweak JS style and the relevant JSHint and JSCS checks.
Comply to the new style.
Remove `boss`.
carousel.js: remove unneeded variable assignment.

`slideIndex` is assigned to the same value a few lines above.