added: some comments in examples
change: made some small stuff more elegant

- version
- logging
- debug enclosure parameter
- duration method call
added: drawing example to main demo

also some minor text changes
change: drawing example modified
bugfix: sizing of pinned element
added: resize event for div containers

also changed sceneRefreshInterval to refreshInterval, as it also
refreshes the size of the container and fires a resize event, if it
changed.
added: controller tests
added: basic ScrollScene tests

and fixed some minor bugs
added: changelog
change: added private note two 2 functions
change: updated text in parallax section example