Bump version to 2012.2.5

Change-Id: Ibf237525fc86d5ba2129620f58d574685a713782
make it possible to debug connection errors

if _connect fails, the reason will be hidden because it doesn't ensure
that hasattr(self, 'connection_errors') before using it.
Merge pull request #9 from novas0x2a/amqp

make it possible to debug connection errors
Use common utils for reading chunks in rbd store
Merge pull request #10 from fattarsi/1146830

Use common utils for reading chunks in rbd store