Document disabled options; update query options.callback's result.results; closes #1626 (2)
Merge pull request #2052 from UltCombo/disabled

Document disabled options [Closes #1626]
Update for nextSearchTerm feature enhancement

https://github.com/ivaynberg/select2/pull/2044
Update select2-latest.html
Merge pull request #2058 from sieppl/gh-pages

Text change to describe nextSearchTerm feature enhancement
Catch up with master
Catch up to 4.0