updated binning function
Update ko_precalculated.biom.gz

Addresses issue #77
Metadata is now added as lists of lists.
Updated tab-delimited output format for new metadata

Since metadata is now lists of lists in biom format then the
delimitedSelf() metadata parser needed to be updated. Use a pipe '|' to delimit each KEGG pathway.
E.g.
level1; level2; level3|level1; level2
Remove unneeded code.
added ability to ignore other/unclassified
allow user to specify labels to ignore via cmdline
fix for split issue on None
metadata_category passed through
Merge pull request #81 from wasade/issue80

updated binning function
Merge pull request #82 from mlangill/issue77

Issue77