Revert import changes

Author: uvchik

windpowerlib/__init__.py

@@ -2,9 +2,9 @@
 __license__ = "MIT"
 __version__ = "0.2.1dev"
 
-from .wind_turbine import WindTurbine
-from .wind_farm import WindFarm
-from .wind_turbine_cluster import WindTurbineCluster
-from .modelchain import ModelChain
-from .turbine_cluster_modelchain import TurbineClusterModelChain
-from .wind_turbine import get_turbine_types
+from windpowerlib.wind_turbine import WindTurbine
+from windpowerlib.wind_farm import WindFarm
+from windpowerlib.wind_turbine_cluster import WindTurbineCluster
+from windpowerlib.modelchain import ModelChain
+from windpowerlib.turbine_cluster_modelchain import TurbineClusterModelChain
+from windpowerlib.wind_turbine import get_turbine_types