Add cards from Epic play reveal.
Fix tests and ship selection.

* Having the extra optgroup in the pilot dropdown confused the select2
  selection methods when there was a pilot named the same as the ship.
  So, the optgroup is now gone, since we only see pilots for one ship at
  a time anyway.
Compilation artifacts.
Add test for Huge-only crew.
Add "(epic)" for epic cards.
Display warning when violating Epic squad building rules.

fixes #40
Styling fixes.
Add serialization v3, which includes game mode.

fixes #42
Merge branch 'feature/epic_rules_reveal'