Changed loops over attributes to use iteritems
Skip writing attribute if value is None

ioHDF5 checks values of attributes before writing.  Attributes with values of None are skipped because HDF5 has no native equivalent.

After calling repack, code checks the last modification time vs the current time.  Only proceeds to delete old file and move repacked file after 1s has passed.

Works in Spyder and allows catching of repack error

Changed subprocess.call for repack to no longer send sys.stderr as stderr.  This breaks in iPython because it overwrites the stderr with an ioStream that cannot be treated as a file.

Moved the functions and fixed imports/calls in io

Words are split with an underscore now

Added the MicroData, ioHDF5, and fixed the imports in the other files. Now, the IO is complete and ready for testing