Resolves issue #1065

Changes the 'simpson_e' calculation to be increase as evenness increases. Reference thread:
https://groups.google.com/forum/#!searchin/qiime-forum/simpsons%2420e/qiime-forum/F7GvTT2Elgw/rU8fnNfLoNMJ
Added another example

Added another test calculation from another ecology lab. Given that the literature definition of this function is unclear, I wanted to have another resource which validates our interpretation.
Changed permissions to 644.
Removed commented line
Merge branch 'master' into issue_1065
Merge pull request #1223 from wdwvt1/issue_1065

Issue 1065