Add function to get generated_by string
Change make_otu_table to use new BIOM API

Also, it now returns a BIOM Table object rather than a JSON string
Fix tests for make_otu_table
Fix confusing parameters in make_otu_table
Fix typos; forgot parens on function call
Fix script interface for make_biom_table
Use write_biom_table in map_reads_to_reference
Merge pull request #10 from adamrp/remove_format_biom_from_make_otu_table

Remove format biom from make otu table