Fix #10324: Add opt-in note to tooltip docs

* Re-added a note (now callout) about need to opt in to tooltip docs
* Converted same note in popover section to callout
fixes #9985: update grid classes in grid example
Rephrase text
Remove multiple touch icons and roll with a single one
Eagle eye
Another fixup
Rumbo Jumbo
Again?
The last
Fixed hardcoded tooltip arrow positioning

Tooltip Arrow positioning was hardcoded to 5px instead of using @tooltip-arrow-width.
Remove old and unused .prettyprint styles in code.less (per #10566)
Merge branch 'master' of github.com:twbs/bootstrap

Conflicts:
	dist/css/bootstrap.min.css
Merge pull request #10338 from twbs/readd-optin-notes

Fix #10324: Add opt-in note to tooltip docs
fixes #10497: Fix Windows 8 and Windows Phone 8 behavior and apply it to the docs
remove unnecessary right and left properties on .modal-dialog
fixes #10497: Fix Windows 8 and Windows Phone 8 behavior and apply it to the docs
Merge branch 'ie_viewports' of github.com:twbs/bootstrap into ie_viewports

Conflicts:
	getting-started.html
	less/responsive-utilities.less
Merge pull request #10584 from twbs/ie_viewports

Fixes #10497: Fix Windows 8 and Windows Phone 8 behavior and apply to docs
re-fix typo in comment
run grunt