Update general information and setup instructions

Refs grnet/kamaki#49
Write a set of short scripts using the kamaki lib

Fixes grnet/kamaki#49
Return volume metadata in "create_volume"

The method used to return results in this format:
  {"volume": {"id": ..., "display_name" ..., ...}}
It now returns the results in this form:
  {"id" ..., "display_name" ..., ...}
as it is the case with every other creation command in kamaki library.