upgraded xslt
hide language selector by default, closes #282
fix sagging print button, #287
disabled print js script + upgraded enketo-core with pure css page breaks and many other print tweaks
Merge pull request #689 from MartijnR/master

bunch of styling fixes, grid select fix, various print style changes, form header changes
Merge pull request #690 from SEL-Columbia/master

bunch of styling fixes, grid select fix, various print style changes, form header changes