copied files from pycogent
added updated uclust from pycogent, fixes #12
updated to latest cogent version
added missing parameter
added license info to __init__
added pynast/pycogent_backports to setup.py
updated to latest version from pycogent
Merge pull request #13 from gregcaporaso/issue-12

added latest uclust version from pycogent, fixes #12 (no more writing to /tmp)