Initial implementation.
Node executor scale state machine.
autoscale step 2
Minors and fixed some tests.
Now the SlipStream Client is tolerant to network fault.
Refactoring of the SlipStream Client (mainly on BaseCloudConnector.py)
Adapted the OpenStack connector (deployment only) to work with the new SS client.
Added the "override" decorator.
Updated the build image process.
Refactored the SS Client.
Extracted UserInfo calss into his own file.
Added some override decorators.
Updated the CloudStack connector.
Removed unused methods.
Some refactoring.
pylint improvements.
Updated CloudStackAdvancedZone connector.
Updated StratusLab connector.
Updated PhysicalHost connector.
Updated the build image process of the StratusLab connector.
Minors.
Fixed some tests.
Removed no longer required test in StratuslabClientTest.  Fixed TestCloudConnectors test.  Minor refactor.
Merge branch 'feature/autoscale-US5-US6' of github.com:slipstream/SlipStreamClient into feature/autoscale-US5-US6
Minor.
Minor - formatting.
Changed method name.
Formatting and imports.
Minor - formatting (folding of long method invocation/definition).
Formatting.