Add One-Sample Student's T-Test

http://en.wikipedia.org/wiki/Student's_t-test
Change variable names of sample to `sample` and known value to be `x`
Merge pull request #8 from mattsa/t-test

Add One-Sample Student's T-Test
Update comment, mention Matt in readme
Add CHANGELOG and bump package, with min/max addition
update readme
Add quantile function and documentation
Add API
Point to API.md
Sort samples numerically

If `.sort` does not get a callback, numbers are sorted by converting them to strings and comparing strings in lexicographic order.  This affected `.median` and `.quantile`.
Ensure `.median` sorts numerically

If `.median` sorts lexicographically then `ss.median([8, 9, 10])` will be 8.
Merge pull request #14 from jthomm/master

Give `.sort` a callback to ensure `.median` and `.quantile` sort numerically.
Take values from sorted as well as tests.
Add alias, improve readme
Update README.md
Become a component
Note comp
Merge branch 'master' of github.com:tmcw/simple-statistics
Update README.md
Fixup bayes, add tests and documentation