Add Example to skbio.core.distance.DistanceMatrix
Remove tab-delimited example text (was unncessary)
Fix typos, import format for numpy, and var name

Conflicts:
	skbio/core/distance.py
Fix doctest failure

Messed up some capitalization.
Fix all numpy imports
Merge branch 'master' of https://github.com/biocore/scikit-bio into issue_168

Conflicts:
	skbio/maths/stats/test.py
Break lines at 79 chars
Break line at 79 chars
Break lines, PEP8 changes
Add import for seterr
Fix PEP8 compliance
Merge pull request #188 from adamrp/issue_168

Add Example to skbio.core.distance.DistanceMatrix