Added uncommitted relation icons
Add onboarding message.
Show/hide onboarding appropriately.
Cleanup localStorage in testing.
Simplify localStorage flag.
Pull out diamond styling into mixin.
Test fix.
Merge pull request #545 from makyo/remove-relation

Added uncommitted relation icons

This includes some code reorganization to be more in line with D3 style and to make the relation rerendering easier to work with.
Merge pull request #546 from kadams54/commit-onboarding

Add onboarding message to call attention to commit button.