change biom.Table.get_biom_format_json_string to biom.Table.to_json
changed biom.parse.parse_biom_table_json to Table.from_json
remove biom.Table.get_biom_fromat_object and get biom.Table.get_biom_format_pretty_print
add from_json tests
Merge pull request #357 from teravest/moretablechange

Moretablechange