Version 1.3
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- added abstract DifferentiablePolicy class
- added abstract BatchAgent class
- new installer, rlpy now on pypi
- moved rlpy code to rlpy package
- major code clean-up
- Learning rate related code moved from Agent to separate class

Version 1.2.1
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- Partially fixed installation issues on OSX and Windows 
- added Swimmer domain
- Visualization for HIV Treatment domain
- Pendulum renamed to InfTrackCartPole

Version 1.2
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- major update for the getting started tutorial
- results are stored in json format
- new module `Tools.results` for examining and plotting results
