Added Nathan's bio to about page
Replaced Tahoe-LAFS references with just LAFS
added user row, coloring to product table
made references to free and open source software more consistent
added blurbs for two products
fixed front page learn more buttons
Made simple email signup pages for each page
fixed button text color, alignment issues
made button links go to the right places, some link style bugs fixed
implemented query form template inheritance
Add Piwik tracking code.

Signed-off-by: Daira Hopwood <daira@leastauthority.com>
Fix some tests that were broken by content changes.

Signed-off-by: Daira Hopwood <daira@leastauthority.com>
Add collect-email handler.

Signed-off-by: Daira Hopwood <daira@leastauthority.com>