-Default values for block size and input file are now given to ArgumentParser
-Added 'type' field in ArgumentParser to validate input variables at load time
-Removed file size limitation of 10MB, now allowing 4K block size at the very least
-Substituted double quotes on strings with single quotes
-Added some initial exceptions and handling - far from over, but ok for initial debugging
-Added handle for BlockStore class - implemented in layer_block.py
BlockStore class added. Read function "get_sync" implemented.