typos in CH2
import pymc as mc -> pm in chapter 3 + typos
typos chapter 4
Revert "Typo and phrasing change"

This reverts commit 5ab2748a0c6c4ad0aa82b950bb9cc7b0af114706.
Merge remote-tracking branch 'upstream/master'
chapter 6 mc -> pm
mergin cebe's work
updating readme
Update separation_plot.py

A typo has been corrected.
Merge pull request #157 from ugurthemaster/master

Update separation_plot.py
Fix typo - missing apostrophe in introduction
Chapter 1 - make Poisson code runnable again
Merge pull request #158 from georgemarrows/master

Typo + code fix to Poisson example in chapter 1
Update DarkWorldsMetric.py

Minor corrections
Merge pull request #159 from ugurthemaster/master

Update DarkWorldsMetric.py
Update SMS_behaviour.py

minor correction.
Merge pull request #160 from ugurthemaster/master

Update SMS_behaviour.py
Merge remote-tracking branch 'upstream/master'
Correct typos

1.  Change reference to Python name attribute to use code formatting (to
distinguish it from ordinary language use of name).
2. Move fullstop from inside bracketed clause to outside.
3. Change upper case T after colon to lower case t.
Correct typos

1. Remove full stop between $X$ and :
2. Change "computational-simpler" to "computationally-simpler"