First commit
Finished Prototype
Finished zoom animation
Refactored
renamed and refactored
Modified animations
Added page number
Finished animation framework.
Modified tutorial
Modified index.html and added tutorial.html
Merge branch 'master' of git:sonic.js

Conflicts:
	index.html
Renamed Sonic to Kadenz

Renamed project name from Sonic.js to Kadenz.js, because the name
`sonic.js' is too trivial and tired name.  The word `kadenz' is derived
from Opera.  That means the speaker and presentation perform like a
Opera.
Modified introduction and removed tutorial.html

The contents are modified for publish in github.
Added warning messages into page transition

The warning messages will be output when the direction is not
unforeseen.
Added README.md