0.4.1
- adjust all spatial operation functions to work with multi-band rasters.
- use gdal exceptions to capture runtime error of not finding the the file.
- add cluster method to dataset class.
- time_stamp attribute returns None if there is no time_stamp.
- restructure the no_data_value related functions.
- plot function can plot rgb imagr for multi-band rasters.
- to_file detect the driver type from the extension in the path.