restore headlines - closes #225. reorder elements in nav
Merge branch 'master' of github.com:nprapps/tshirt
more fun with the navbar. #223
make the nav play nicer
small screen titlecard design
Merge branch 'master' of https://github.com/nprapps/tshirt

Conflicts:
	templates/index.html
toying with chapter prompt text sizes
Merge branch 'master' of github.com:nprapps/tshirt
modifying the index chapter nav on touch devices
Merge branch 'master' of https://github.com/nprapps/tshirt

Conflicts:
	less/app.less
small screen index background
Form with validation works. Use ?test=true to view form with working CSS.
Merge branch 'master' of github.com:nprapps/tshirt
Adds a link to Pietra's book.
tablet title screen
Merge branch 'master' of https://github.com/nprapps/tshirt
tablet home page title size increase
Round-trip for payment processing is working.
Merge branch 'master' of github.com:nprapps/tshirt
cleaning up small screen chapter nav