added a Matlab function that converts images to one envi file
Just some notes Dr. Mayerich:
1. The images should be stored in a struct to be loaded in the function.
2. I cast any type to float. So, if we have some files of 'double' type, we might loose some accuracy.
3. I just included the 'samples', 'lines', 'bands', 'header_offset', 'file_type', 'data_type' and 'interleave' parameters in the header file.
Please let me know if you need any other things to be added to the function.
See merge request !6