Morse code trainer

Keys

2014-03-16 Made the default configuration more novice-friendly. Thanks, orie, for the suggestion!
2014-03-13 Fixed punctuation characters typing.
2014-03-11 Added speed setting. Small cosmetic changes.
2014-03-09 Fixed letter scoring for 2-5 character sequences mode. Settings and letter progress are now saved to local storage.
2014-03-07 Added letter chart. Added 'Recent updates' and 'Known issues' sections.
2014-03-05 Added character sequences longer than one letter. Characters are shown when they are typed, not at the end of the sequence.
2014-03-03 Published the initial version.

All guessed letters are marked as incorrect, even if some are correct. Scoring doesn't penalize the correctly guessed letters though.
UI is not nice.