Merge tag '0.4.1' into develop

Bugfix in the definition.validate() method
Shortened timeouts for disconnect retries
Removed volume_info
Clarifying changes with comment
Merge pull request #10 from datasift/feature/client-reconnect

Feature/client reconnect
Bumped version number and updated readme
Merge pull request #11 from datasift/feature/client-reconnect

Bumped version number and updated readme
Merge branch 'release/0.5.0'