RGA subplot function and some pep8

Added a function to the existing RGA file that plots a subplot for each
element of the RGA matrix. Also changed some stuff in the file to be
pep8 compliant.
Reworked Example 2.3

Reworked Example 2.3 for transfer functions of any order
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
Pythonificiation of some changes
Merge branch 'master' of https://github.com/alchemyst/Skogestad-Python
Merge remote-tracking branch 'upstream/master'
Merge pull request #71 from SimonStreicher/master

Added MIMO uncertainty bound calculation
Merge remote-tracking branch 'upstream/master'
Merge branch 'master' of https://github.com/alchemyst/Skogestad-Python
Pythonificiation of some changes
Added MIMO bound uncertainty bound calculation
Ex 6.8
Merge pull request #72 from ibassa08/master

Added Exercise 6.8
Merge remote-tracking branch 'upstream/master'
Added Figure_5_22

Also applied pep8
Merge pull request #73 from ibassa08/master

Added Figure 5.22
Added Figure 5.5

Applied Pep8
Merge pull request #74 from ibassa08/master

Added Figure 5.5
Solved example 7.6