Add solutions for 7a-c
Tidy up 7a-c
Finish problem 7
Add output for 7.Rmd: 7.html and 7.md
Add more on how the Bayesian solution is the mode
Merge pull request #36 from jdavis/master

Add solution for Chapter 6, Exercise 7, closes #27
Merge branch 'master' into gh-pages
Fixed Chapter 6: exercise 7 link