Remove debug logging

Signed-off-by: Zygmunt Krynicki <zygmunt.krynicki@canonical.com>
Add next() as non-cachable method

Signed-off-by: Zygmunt Krynicki <zygmunt.krynicki@canonical.com>
Remove old example

Signed-off-by: Zygmunt Krynicki <zygmunt.krynicki@canonical.com>