autopep8 --ignore=E501 fixes.

The code in this chapter was already fixed so the
improvement is debatable.
Merge remote-tracking branch 'cam/master' into chap2-style

Conflicts:
	Chapter2_MorePyMC/MorePyMC.ipynb
Ending code cells with a semicolon.
Merge branch 'cam-master' into chap2-style
Not adding or removing semicolons
Merge pull request #187 from eli-b/chap2-style

autopep8 --ignore=E501,E703 fixes.