Add old classes for compability and sort dicts.

[pswaminathan]

• Add RMXStrategy and RMXStrategyROITargetPixel class for compatibility. These strategies are deprecated, but the API will return those types anyway, so let's add them for the time being.
• Classes in service.py dicts should be ordered alphabetically, not randomly.

[pswaminathan]

I'll resolve the merge conflicts once it's reviewed and we have the reports branch merged in as well—it'll be easier to rebase that way.

[FodT]

Looks good - I'd suggest throwing a UserWarning if instantiating deprecated classes. @pswaminathan suggested that checking if the properties were empty could be a good way to detect if it's being instantiated by a user rather than implicitly by service.py