DOC: Add note about py3k

The README.rst file was listing 2.7 as the python version needed, which
is misleading as skbio supports 2.7 and 3.4.
DOC: Make documented version more inclusive

Thanks @Jorge-C
Merge pull request #388 from ElDeveloper/3.x

DOC: Add note about py3k
fixes #365
fixed rst formatting error
fixed typo
Skip another stochastically-failing test

See #386.
Merge pull request #391 from ElBrogrammer/skip-stochastic-failures-2

Skip another stochastically-failing test
fixed typo
DOC: Add missing blank-line in Examples

Docs were not rendering correctly because there was no space between the
`Examples` title and the contents in the example. Since the change was
very minor I also PEP8d the code in the example.
Merge pull request #392 from ElDeveloper/doc-fix

DOC: Add missing blank-line in Examples
updated to use pip instead of setup.py for installation, for consistency
updated developer install instructions
Merge pull request #390 from gregcaporaso/issue-365

added some notes to the readme on install of development version and testing
Very hacked bioenv/BEST port from qiime.stats

But tests are passing!
Add test data to data directory
Match SampleID column name to what's used in QIIME

Doesn't really matter, but might as well be consistent.
Complete rewrite of bioenv algorithm

Much shorter and cleaner. The previous implementation had a bug where the environment variables weren't being scaled before calculating Euclidean distances. The results now match R's vegan::bioenv function.

Returns a pandas data frame for easy formatting of results that are very similar to what you get in R.

Still have a bunch of TODOs to fill out, more unit tests to add, performance testing, etc.
Ensure implicit column order is maintained
Add check for duplicate column names