fix date filter width issue #382
fix sorting of comments (old to new), fixes #350

Misspelled property ("creationDate" is correct) and needed to reverse equality operator to greater than.
do not sort empty answer objects, fixes #389
do not sort empty comment objects, fixes #389
pressing Enter key in search box should submit a search, fixes #386

see: http://stackoverflow.com/a/15418063/3682288