API: cache is now by tip
ENH: smarter tip and non-tip lookups
merge fix
Merge branch 'master' of github.com:biocore/scikit-bio into cache_fix

Conflicts:
	skbio/core/tree.py
ENH/API: assign_ids now matches IDs from index_tree, to_array now
returns an array representation of the tree
Merge branch 'master' of github.com:biocore/scikit-bio into to_array
Merge branch 'master' of github.com:biocore/scikit-bio into to_array

Conflicts:
	skbio/core/tests/test_tree.py
Remove custom stylesheet

Fixes #339.
Added links to projects
Added some text
Add Google Analytics tracking

Fixes #240.
fixes #300
Merge pull request #341 from johnchase/projs

Projs
Add documentation to is_symmetric_and_hollow
Merge pull request #340 from ElBrogrammer/doc-style-fix

Remove custom stylesheet
Merge pull request #320 from wasade/to_array

To array
Added Fisher methods to skbio

The Fisher pvalue methods for transforming between z score and corr_coef as well as from a set of correlation coefficients for different samples to a population corr_coef have been added.

Also updated the doc strings for several functions to add a notes section as suggested.
Added Pearson and Spearman

Added Pearson and Spearman which wrap numpy.corrcoef and scipy.stats.spearmanr (respectively). The wrapping is necessary for now because they calculate things we don't need or the format is wrong for the vast majority of current uses in the code base. This can be rectified at a later time and these wrappers could then go away.
Added Kruskal Wallis

Added the Kruskal Wallis test from scipy after verifying that it was faster than the version I had written in pycogent_backports (my vanity hoped for at least speed parity, I was off by only a factor of 10^3)
Large commit to add ManWhitneyU

MannWhitneyU and its bootstrapped varients were added in this commit. I made a significant change to the MannWhitneyU code based on what I believe to be the correct interpretation according to scipy documentation. The test code included now makes a lot more sense in terms of agreement between pval betwen the bootstrapped and non-bootstrapped version.