Matlab writeFileAnnotation

This PR was useful in attaching huge logs to datasets/projects during dogfish import. This was used as a client side log attachment, and includes an RFE to accommodate writing the annotation in chunks.

Test : 
fileAnnotation = writeFileAnnotation(session, local_file_path);
link = linkAnnotation(session, fileAnnotation, 'Image', image_id);

Note: Use a file which is atleast greater than 64mb.
You could move `fread` inside the loop instead of reading the whole file into memory.