Add not about release 0.9.0 to news section
Output kegg pathway metadata in tab-delimited output of predict_metagenomes.py

Addresses #75
Merge pull request #76 from mlangill/issue75

Output kegg pathway metadata in tab-delimited output of predict_metageno...
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
level -= 1 if level > 0
moved level modification outside of nested function
Merge pull request #83 from wasade/cat_level_indexing

level -= 1 if level > 0
Add more docs about biom and tab-delimited files
Add detailed docs for collapsing functional categories and use with QIIME
Change PICRUSt biom table output to Gene Table
Merge pull request #84 from mlangill/pre_0.9.1_release

Pre 0.9.1 release