Moco-wrapper

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* Query strings conversion into lower case

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* Implement support for days parameter in User holidays
* Implement Purchase Categories

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* Implemented Paging of Listing Models
* Implemented the creation of fixed price projects
* Implement Project Payment Schedules for fixed price projects
* More Documentation and even more code cleanup

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* Implement authentication via email and password (note that the class constructor also changed, if you do not want that continue to ues the previus version (0.4.1))
* Create readthedocs documentation (see https://moco-wrapper.readthedocs.io)
* Error Responses are now converted into actual Exceptions that are raised
* Code Cleanup

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* Implemented impersonation
* Fixed makefile (make test does work now if you have the required packages installed)
* Created documentation see (https://moco-wrapper.readthedocs.io/en/latest/)
* Added named arguments requestor and objector to moco_instance constructor (Setting the requestor via moco.http is no longer possible, user moco.requestor)
* Removed cli component

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* Finished reworking all the integration tests
* Prefixed Employment, Holiday and Presense with "User" for clarification
* Moved duplicated methods id_generator and create_random date into base class
* Implented additional requestor that only tries once to request the api endpoint (no retrying)
* Main moco object moved to namespace moco_wrapper.moco
* Changed author email