Options

Added options for notification of unknown songs. Also removed the
paragraph about history since it's no longer true :-P
Notification

Shows a notification on unknown songs
ID

The YouTube-connector sends a unique ID per track that is saved in
history (or URL as fallback)
Enter to submit

Wrapped the popup in a form for easier submit with enter-key
Check history first

Moved the history-check so it allways checks the history (makes it
possible to change the name for identified songs)
Rename popup.js to change.js
Rename popup.html to change.html
Update scrobbler.js
Update change.html
Merg

Merging history and display-info
Merge

Merged history and master
Redesign

Redesigned the change information popup
Indenting

Fixed indenting and other annoyance
Remove song from history

It is now possible to remove one single song from the history
Need unique ID for history

The connector needs to send a unique ID for the history to work (the
MD5(url) will most likely not work in all connectors either way).