Resizable: modified to allow resizing when resizables are nested.

Fixes #5025
Closes gh-1149
Draggable Unit Tests: Ensure IFRAMEs can be written to

Draggable tests were failing in IE because the frame needs to be
written to to be accessible to further DOM manipulation.
Draggable: Test fix regarding static scrolling

No longer checking scroll positions of static scrolls since the fixture is
in an absolute container.

Closes gh-1145
Resizable: containment now works with non - immediate children

Fixes #7485
Closes gh-1130
Resizable: fix whitespace on containment plugin
Resizable: containment plugin restricts resizing within container

Fixes #7018
Fixes #9107
Closes gh-1122
Resizable: remove redundant comments and whitespace
Selectmenu Tests: add unit tests for empty options
Menu: Add _isDivider method

Ability to prevent generation of dividers from items

Fixes #9701
Selectmenu: Fix empty option processing

Ref #9701
Selectmenu: fix lint issue
Tooltip: Improve accessibility by adding content to an aria-live div

Fixes #9610
Closes gh-1118
Tooltip: On close and destroy only set title if empty or undefined

Ticket #8925 states that changes to the title attribute while the
tooltip is open are lost on tooltip close.

In the close and destroy functions, the title attribute is always
written if a value was stored in the element on open. It is possible
the attribute has changed and restoring the initial value may overwrite
the current value.

If the value is empty or undefined as set in open, do not set the title
attribute.

This fix has the limitation that if the user removed the title
attribute or set the value to an empty string the original title value
would be restored on close and destroy.

Fixes #8925
Tooltip: Lowercase test html for IE7/8 compat
Tests: Add link to visual test for selectmenu to index
Tests: Fix grammar error in comment

Changed it's to its.

Closes gh-1164
Menu: Fix var declaration and move regex comment to the right place.

Follow-up to a6806ab1
Tooltip: Only bind remove handler for delegated tooltips

The remove handler was being added for every tooltip, but only removed for
delegated tooltips. The default destroy behavior already handles non-delegated
tooltips, so the handler should only be added for delegated tooltips.

Fixes #9531
Closes gh-1156
Docs: Reduce contributing guidelines by linking to contribute.jquery.org

Closes gh-1161
Resizable: whitespace fixed

Closes gh-1162