Tags: nuddelaug/python-device42api

* adjusted setup.py for pypi

* made available CustomField class

* added class methods add_customField for various classes
* added class ServiceLevel
* added class History
* added method save_dnsRecord for class IPAM_ipaddress
* added class IPAM_DNSRecord
* change Device42API class method get_assets to get_asset
* change all classes save method to use self._api_path
* added Device42API methods
    - get_service_level
    - get_history
    - get_device
* updated documentation accordingly

* updated Doc strings of all classes (except IPAM_switch) with exampl…

…e code after getting a new Trial Appliance

* moved json from API and json from Object compare in get_json method to Baseclass as __get_json_validator__
* added methods for API object:
  - get_macid_byAddress
  - get_pdu_models
  - get_racks
  - get_assets
  - get_patch_panels

* updated gitignore

* unified comments on not implemented classes
* added sphinx docs