Update requirements.txt to get rid of weird webassets version number.
Fix staging warning banner so it's not as disruptive.

Let's you see Flask's "flashed" banners. Closes #29
Change /cpw endpoint to /change-password; Closes #28.
Center text in the staging-server warning banner.
Center text in the staging-server warning banner.
First crack at redesigned front page.

Not 100% on the blue, but I kinda like it and imho good enough for now. Happy to discuss.
Note the radial gradient behind headline doesn't work in IE<10, but then nothing else we've
done is tested to work there, either. Is problem for later.

Still have to redo wording on the 3 supporting points below.
The orange has its flaws but I think it's better than the blue.

Also tweaks color of "sample profile" link.
Tweaked headline color. No more of this, going to bed.

I think the problem is actually the button...you want it to stand out, but it's too much.
The color is all Boostrapped in there, though, so not sure how to change. Maybe project
for later...