Tests: Use closeEnough() to account for rounding differences

Selectmenu's test suite broke with b0e8380, which changed the padding
used by the menu widget. Selectmenu conditionally adds pixels to the
menu's width, and using closeEnough() accounts for that and the
rounding differences across browsers.

Closes gh-1275
Build: Update DB version for releases
Build: Updating the master version to 1.11.1-pre.
Build: Update license

Closes gh-1257
Merge branch 'master' of git://github.com/jquery/jquery-ui into 7953-datepicker-show-year-month-in-different-lines
Datepicker: show year/month on same lines

Fixes #7953

Added CC0 verbiage to file header per IBM/jQuery Foundation discussion