more docs for azureblob flavor (#664)

Signed-off-by: Ahmet Alp Balkan <ahmetalpbalkan@gmail.com>
move azureblob configuration to ADVANCED.md

Signed-off-by: Ahmet Alp Balkan <ahmetalpbalkan@gmail.com>
Merge pull request #665 from ahmetalpbalkan/master

more docs for azureblob flavor