Transform console.error call to named function.
Unify success/error messages under var statement.
Ensure dictionary order is maintained on update.
Fix invalid dictionary concatenation.
Add more information to errors.
Update kanji dictionaries.
Add "1k" and "10k" to user friendly meanings.
Add clarification comment about EUC-JS conversion.
Replace innerHTML by textContent where possible.
Fix question overlap bug.

The transitionEnd event seems to be unreliable and does not fire in
certain circumstances, especially when multiple transitions are taking
place at the same time. Replaced all subscriptions to transitionEnd
event by simple timers (setTimeout).
Prefix log messages with extension name.
Bump version to 0.6.6
Merge branch 'develop' for version 0.6.6