Merge pull request #3 from alchemyst/master

Updating
Merge branch 'master' of https://github.com/SimonStreicher/Skogestad-Python
Merge branch 'master' of https://github.com/alchemyst/Skogestad-Python
Applied pep8 to Chapter_06.py
Renamed Example_04_04_Control_Toolbox.py
Applied pep8 to Chapter_05.py and deleted redundant versions

Files SISO_08rule.py and SISO_RULES.py are redundant compared to Chapter_05.py and have been deleted.

siso_controllability.py has the same aim as Chapter_05.py but utilizes the control toolbox.
Merge pull request #50 from SimonStreicher/master

Applied pep8 to Chapter_06.py and Chapter_05.py