Add BSD license
Update doc license to BSD
Minor doc updates for new BSD license
Update copyright in source files
Update license in source files
Updated copyright in source files in some stragglers
Update copyright in sphinx conf
Update changelog with license change info
Update top-level source files with new header
Add header to biom/ source files
Add header to unit test source files
Update changelog message to be clearer
Add attribution docstrings to functional code
Add attribution to unit tests
Update ChangeLog and license per @gregcaporaso's suggestions
Merge pull request #226 from jrrideout/issue-152

Change license to BSD