Added support for broadcasting in binary table columns.
Changed according to comments in pull request.  Changed str to basestring, and row to key.  Also changed from iterating over the array for assignement to aslicing.
Added initial unittest to test table broadcasting.  test_array_broadcasting in test_table.py
PEP8 change to whitespace in parenthesis, fits file opens inside with loop, and addition of pull request URL to docstring in test_array_broadcasting unittest.
Merge pull request #48 from justincely/table_broadcast

Added support for broadcasting in binary table columns.