Change -o option type for cluster_quality.py

new_path -> new_filepath
added function write small test data set files to output_dir

This function is convenient for interactive testing. If you need
some test files to work with, you can just run:

python -c "from qiime.test import write_test_data; write_test_data('.')"
Merge pull request #890 from gregcaporaso/get-test-data

added function write small test data set files to output_dir
Merge pull request #882 from ElDeveloper/cluster_quality_option

Change -o option type for cluster_quality.py