* added id assignment after save to objects
* change and updated Documentation
* added class PatchPanelModule
* added class Customer
* extended methods from Device42API to handle
    - get_macid_byAddress
    - get_pdu_models
    - get_rack # instead of get_racks
    - get_patch_panel_modules
    - get_customer
    - get_building
    - get_room