Removing old help tooltips
Encorporating logo with hexagonal shadow and navbar border
Including logo with reduced logo text size
Restore development flag: stealing thimble ribbon but with SHA tooltip on hover
Bring the test ribbon to the front
Smooth edges in FF
Moving test ribbon style definition out of backpack.less
Merge pull request #629 from stenington/596-logo

Include logo
Merge pull request #630 from stenington/597-remove-help

Removing old help tooltips
First stab at sign-in page graphics and text
Sign in page tweaks from Jess' feedback
Added link without styling
Only show sign in link on sign in page, until we're on the Persona Observer API
Remove unused art [ci-skip]