fixes#469 doc fix to to_hdf5 and from_hdf5
Updating documentation to reflect the new format
Fix line length on documentation
Making sample_metadata and observation_metadata private, and fix all the code in table
Fixing test_metadata_adder.py
Fixing test_table_converter and table_converter
Fixing parse and test_parse
Changing metadata(axis='sample') -> metadata(): it is the default
Added group metadata
Adding add group metadata and tests
Changing all accesses to private variables to metadata()
Changing HDF5 representation
Updating test tables to new format
Changing example tables to new HDF5
cleaning up from_hdf5 code
Removing code duplication
Solving merge conflicts
Fixing documentation
fixing merge conflict
API: default min_count changed to 1