Test case for VirtualSystemDescription.
IVirtualSystemDescription.set_final_value can now accept str, int and subclasses of Enum. Tests for set_cpu, set_mem and set_soundcard. Skeleton for the others setters.
Merge pull request #17 from nilp0inter/VirtualSystemDescriptionTests

IVirtualSystemDescription tests
fixed error raising bug
bump to version 0.1.5
If wget failed, give curl a go.
no longer shipping distribute