Modified add_qiime_labels.py script to use a standard metadata mapping file instead of custom mapping file to be more intuitive to use with the rest of QIIME.  Updated unit tests.
The coverage_category states are returned instead of their number.
Updated tests to work with new function signature.
Added optional splitter_category parameter.

Partial support for (optional) splitting of mapping file prior to filtering.
Added some preliminary error handling unit tests and pulled the "meaty" code
into a "private" function ```__filter_sample_ids_from_category_state_coverage()```.
Finished implementation of splitter_category.

Still need to add more unit tests.
Added unit test for splitter_category.

Also cleaned up some duplicate code in the unit tests and added docstrings to
new helper function.
Updated ChangeLog.
Updated splitter_category docstring.

Improves clarity.
Added changes to add_qiime_labels script/library to Changelog
Merge branch 'master' into timeseries_filtering

Conflicts:
	ChangeLog.md
Update doc/scripts/beta_diversity_metrics.rst

this file was missing the binary_out_gain option that is present in Qiime. I am not sure what the description should be so I copied the Qiime Feb 2011 changelog where this was intriduced for the first time
Modifying exclude_seqs_by_blast.py in order to store the output in a folder.
Changed relatedness.py library to run significantly faster and use less memory by vectorizing operations where possible and reducing redundant calculations.
Modified the documentation on the scripts and the header documentation to be clearer and more accurately reflect what was being calculated.
use BIOM Table API instead of per-element lookups
improved varible name
added contribution
Merge pull request #649 from wasade/otu_cat_sig_perfbug

use BIOM Table API instead of per-element lookups
Merge pull request #645 from zachcp/patch-1

Update doc/scripts/beta_diversity_metrics.rst
Merge pull request #630 from jrrideout/timeseries_filtering

Further improvements to timeseries filtering.