Add schema.
Fix some schema issues.
Change column name.
Implement models.
Trailing comma consistency.
Starting milestone routes.
Can GET a single milestone.
Test harness: Use JSON unless multipart is necessary
Can create new milestones.
Can delete milestones.
Get milestones for a badge in the showOneBadge route
Can update milestones.
Whitespace
Allow `null` for milestone action

So cities are currently do not want any action to happen automatically
with milestones. I suppose the best way to represent this is with NULL,
though perhaps we might also consider another enum, like "nothing" or
something.
ToResponsing badge data from getBadge route
Merge pull request #85 from mozilla/milestone-badges

Milestone badges