Merge pull request #92 from pdawsonsa/master

MIMO Nyquist plotting function and performance weighting function
Merge pull request #93 from pdawsonsa/master

For utils.Wp specified which weighting function was used.
Merge pull request #94 from pdawsonsa/master

Added disturbance rejection function
Merge pull request #95 from pdawsonsa/master

Corrected the documentation to comply with the Numpy format.
Initial perturbation delta unstractures
Merge pull request #97 from Fugacity59/master

Initial perturbation delta unstractures
Updated documentation for utils.findst
include the unstable proportional gain in the plot. Format this line to be the same as in Skogestad. Limit the y-axis to between -0.5 and 2.5
Merge pull request #98 from kendasareking/master

Updated documentation for utils.findst
Simple Sphinx config for documents
Merge remote-tracking branch 'upstream/master'