add link from prelim README to statistics.md
change filename Statistics References.md to statistics.md
add many links to statistics.md and reformat video links - resolves #70
Merge pull request #86 from justmarkham/stats

stats document - reformat video links, add more links, rename file, and add link from prelim README
re-arrange to follow new plan
Merge pull request #87 from ajschumacher/re-order

re-arrange to follow new plan; resolves #84
add numba reference; resolves #79
Merge pull request #88 from ajschumacher/numba

add numba reference; resolves #79
add link to article quoting Asimov (resolves #44)

The two EDA/visualization days likely need to be rebalanced.
This article is probably a better introduction than the messy
Tufte article. Focus: EDA and data viz are tightly linked,
and important.
Merge pull request #89 from ajschumacher/eda_funny

add link to article quoting Asimov (resolves #44)
add to, clarify python notes - resolves #59
Merge pull request #91 from ajschumacher/braces

add to, clarify python notes - resolves #59
add StatSoft book. resolves #65
Merge pull request #92 from ajschumacher/statsoft_book

add StatSoft book. resolves #65
cleaned up and similar styles for testing

This switches out the infix overloading from Bob, which
was cool but possibly confusing. Now a function named
`equal` is used in both the Python and R files, to similar
effect. Would be good to test this more, but I think it
should be good to go.
Merge pull request #96 from ajschumacher/approximate_tests

cleaned up and similar styles for testing - resolves #90
rename files so they order better
Merge pull request #97 from ajschumacher/rename_yets

rename files so they order better
fix ordering; - comes before, _ is after letters
Merge pull request #98 from ajschumacher/rename_yets

fix ordering; - comes before, _ is after letters