Organize imports
Typo
Add SensorML 1.0.1 MimeTypes to ConverterKeyTypes
Remove MAX_GET_OBSERVATION_RESULTS_DEFINITION and use instead HYDRO_MAX_NUMBER_OF_RETURNED_VALUES.
Update HYDRO_MAX_NUMBER_OF_RETURNED_VALUES definition that 0 is no restriction.
The same for  HYDRO_MAX_NUMBER_OF_RETURNED_TIME_SERIES.
Update related check methods .
Merge pull request #98 from CarstenHollmann/change/max_count_for_observation

Change/max count for observation