Fixed a comment.
Services are now named by the factories that create them,
for easier retrieval by the test case.
Removed unused fixture file
Added basic stub server implementation (GET requests only)
Added validation of required/optional params
Error message for missing params now prints the entire list.
Changed interface for BaseService to retrieve params by name
Created DjangoServer implementation to abstract Django services
DjangoServer now executes all management commands as separate processes,
to avoid settings conflicts.

DjangoServer allows settings to be overridden.
Fixed broken DjangoServer tests.
The Django management wrapper isn't yet tested.