add About and How-we-work pages
add Shareabouts page
Merge branch 'staging' into branding
add Shareabouts to menu
add shareabouts link to index content, edit how-we-work header
rename how-we-work
add discussions to menu
move help & feedback link
add sign up link below index features
remove PIAB references in signup and email templates
Merge pull request #49 from openplans/branding

Branding