Change Match.active to not need the project as param

We can use other scopes to filter by project. Also you can filter using the
`project.matches.active`
Merge pull request #260 from neighborly/jl-change-active-match-scope

Change Match.active to not need the project as param
Add sass variable for the blue color
Create style and html to show list of active matches
Change the default locale format of date

On #228 we show the date as the american way. So, since the projects runs by
default in USA, we can change the default format of dates.
Show matches from database
Show matchers in project sidebar
Create feature spec for showing active matches

Active matches are shown on project page