Turn off autocorrect and autocapitilze

On e.g. mobile devices, it's more user friendly to turn off autocorrect in input fields. This patch adds the attributes autocorrect, autocapitilize and spellcheck. See also:

http://davidwalsh.name/disable-autocorrect
Merge pull request #1298 from dirkpostma/patch-1

Turn off autocorrect and autocapitilze