adding cancel style for buttons

use this by assigning class ‘button cancel’ to your div.
standardizing quote use and enabling the challenge menu in index
more style magic

button hover is now less intrusive, enabling display of challenge menu,
adding ‘tiny’ button style.
Merge branch 'develop' of github.com:osmlab/maproulette into develop

* 'develop' of github.com:osmlab/maproulette:
  Constraining dialog to 65% of screen
  Help dialogs need scrollbars sometimes
  More help help
  More help help
  More help help
  Adding help dialog to the controls

Conflicts:
	maproulette/templates/index.html
Merge pull request #114 from mvexel/develop

styling updates