update to fix issue #73

also updated usage examples to reflect recent change to allow this to run without any parameters (i.e., everything gets read/built from qiime_config, if available, and if not the parameters are required.
updated README to be more informative
Fixing error with distance_matrix_from_mapping.py in Clout
Merge pull request #80 from antgonza/fix_for_distance_matrix_from_mapping_in_clout

Fixing error with distance_matrix_from_mapping.py in Clout
Added test data for add_qiime_labels.py
Merge pull request #75 from gregcaporaso/issue-73

This should address issue #73
Modifying add_qiime_labels test data files to fix merge conflict.
Merge pull request #82 from walterst/master

Updated add_qiime_labels test data
Adding folder for exclude_seqs_by_blast
added updated files corresponding to qiime issue #477.
added output directory
Merge pull request #83 from josenavas/exclude_seqs_by_blast

Adding folder for exclude_seqs_by_blast
moved to reflect renaming of qiime script
updating output
added output directory (some updates to output from previous iteration)
Merge pull request #84 from gregcaporaso/core-analysis-updates

new files corresponding to refactoring of core_qiime_analysis to core_diversity_analyses
update import to handle renaming of qiime/workflow.py to qiime/workflow/util.py, as described in qiime #698.
Merge pull request #87 from gregcaporaso/workflow-updates

update import to handle renaming of qiime/workflow.py