test/views/error: Add status-500 test
test/views: Add download page test
Bump release version for '0.3.10'
Apply clojure linter style recommendations

Use:

 * (if-not x) instead of (if (not x)).
 * (seq x) instead of (not (empty? x).
Automatic indent of Clojure sources
Merge branch 'release/0.3.10'