After clearSearch nextSearchTerm is not cleared

https://github.com/ivaynberg/select2/issues/2753
After search with 'query', should highlight element what is currently selected

https://github.com/ivaynberg/select2/issues/2751
Fixed not to break use case: setting the new value after someone was just searching with a different value

https://github.com/ivaynberg/select2/issues/2751
Merge remote-tracking branch 'origin/2753' into 3.5.1-fixes-20141022

* origin/2753:
  Fixed not to break use case: setting the new value after someone was just searching with a different value
  After clearSearch nextSearchTerm is not cleared