Add jarkeeper.com badge.

Adds a badge which displays the dependencies status.
Upgrade eastwood plugin to 0.2.0.

Exclude of linter _constant-test_ is necessary because it evaluates the
expanded _html5_ macro defined by _hiccup_ which produces a warning.
Merge pull request #132 from mvitz/jarkeeper-badge

Add jarkeeper.com badge.
Merge pull request #133 from mvitz/eastwood-0.2.0-upgrade

Upgrade eastwood plugin to 0.2.0.