removed mouseleave from autocomplete editor,
fixed not working demo (JSON.parse() takes string as a argument). refs #1609
fixed not working demo: http://handsontable.com/demo/autocomplete.html (Autocomplete strict mode (Ajax)) ->  JSON.parse() takes string as a argument. refs #1592
fix datatype for servers that don't respond with correct MIME type
Merge branch 'feature/issue-1609' into develop