feat/navigation - fixed 'Return Home' button on interview page so that it turns off camera.
feat/navigation - Disable 'Start Interview' button on Interview page when there are no questions.
Interview page:
 - Changed preview video so that it only loads when a button is pressed.
 - Begin Interview is now disabled if there are no questions tied to the deck.
 - Buttons now show up above video panel to match question page.
 - Added code to stop the hardware camera when navigation changes.
 - Various and sundry other changes for layout
 - Resized video panel

Questions page:
 - Added code to stop the camera when necessary
 - Reworked layout so that it all fits on the page without scrolling for a normal window
 - Added initial navigation to Save button.
Merge pull request #49 from davidderiso/feat/navigation

Feat/navigation