Draggable: Account for z-index set in CSS for the stack option.  Fixed #9077 - Draggable: stack option resets the z-index
Removing unnecessary wrapping of this in draggable's stack option handling.
Merge branch 'draggable_fix_9077'
Theme: Collapse border in .ui-helper-cleafix. Fixes #8442 - CSS: ui-helper-clearfix bug within table with border spacing.
Updated AUTHORS.txt.
Grunt: update generate_themes task to use the new DownloadBuilder API

- DownloadBuilder accepts the config file as an option. It's not necessary
  to workaround it by changing the DownloadBuilder config file anymore;
- DownloadBuilder has exposed a method to generate the theme gallery bundle;
Build: Cleanup.
Build: Use fs.existsSync() instead of path.existsSync().
Updating the master version to 1.10.2pre.
Sortable: Inject a CSS rule to style the cursor. Fixed #7389 - sortable: 'cursor' option didn't override CSS cursor settings.
Dialog: Don't hard-code widget data key. Fixes #9097 - UI dialog inheritance.
Datepicker: Updated German locale. Fixes #9098 - Datepicker German localization - make casing of previous/next/today consistent.
Dialog: Extract check for which elements can gain focus into its own method for overriding. Fixes #9087 - Dialog: Allow registering elements outside a dialog for use when a modal dialog is open.
Sortable: When sorting table rows, create a td to force dimensions. Fixes #4765 - Sortable: Placeholder not displayed when sorting table rows.
Draggable: Revert flag honours Sortable revert speed. Fixed #9103 Draggable: revert option reset after being added to a connectedSortable.
Tabs: Use border-bottom-width instead of border-bottom to remove the border on tabs. Fixes #9111 - Tabs: Can't inherit border-bottom-color for vertical tabs.
Spinner: Call _stop() on blur. Fixes #9112 - Spinner keeps changing after losing focus.
Autocomplete demo (Combobox): Don't highlight term matches. Fixes #9086 - Autocomplete: Incorrect escaping in combobox demo.
Autocomplete demo (Combobox): Rename selected event to select.
Autocomplete demo (Combobox): Split code into smaller functions.