completed a full Model Matching example

It was a bit of a trial to construct a Model Matching example.
The book Discrete Time Control Systems by Ogata seems to be the
only good example.  The version provided by Dr. Adel Ghandakly is
significantly different and does not appear to be identical.
Nonetheless this method could still be useful.
added license and README
removed obsolete engine_idle Matlab code
fixed some minor wording in README
added no control to pole placement example

One of the pole placement examples only had the
output response with control.  The output response
with no control has been added for comparison.
added plot of system designed from specs example
systems specs work with shifted step input

Interestingly, if the step input is scaled and shifted
the specs are still met.  A plot was added that shows
this is the case even for very large values.
added Control Law example using 'initial' function
another Control Law example, doesn't work in Octave?

Another Control Law example has been added from
Franklin & Powell.  But the code does not work correctly
under Octave due to incorrect dimensions.
Control Law example working, correct?

The previous Control Law example (cl_ex82) along with
another that is similar (cl_ss512) are both working.
But they do not agree with previous plots that were
generated with Simulink.  More investigation is needed.
imaginary acker, verified Control Law examples

The Control Law examples have been checked against Matlab/Simulink.
All issues have been fixed and they both now agree.

In some cases the 'place' function produces imaginary values
in Matlab whereas it doesn't in Octave.  This can be seen
with cl_ex82 or cl_ss512 when they use 'place' in Matlab.
To make sure this problem is avoided 'myacker' is now used
for all cases and it also removes any non-real values.

A 'misc' directory has been added as a place to put general examples.
added not about Matlab addpath and software versions
nicer tikz diagrams, Control Law example in notes

Updated some tikz block diagrams to use nicer look styles
with drop shadows.

Added Control Law example to notes document.
removed generated .pdf, put latest in 'build' branch
added link to pdf in build branch
added a 2nd order Control Law example
Control Law, Full Order Predictor Estimator working

Another Control Law example has been built.
This one is a full order predictor estimator.
The example still needs to be described.
plot of predictor along with non-predictor

For the plot of the full order predictor estimator,
the plot of the non-predictor has been overlaid
for comparison.
mis-configured Control Law example

The Control Law example with prediction was mis-configured.
The multiplication of two systems (A*B) is not the same
as series(A,B) in the Octave control toolbox.  Oddly, it
does seem to be the same as (B*A).  In any case, series()
should be used since it is more explicit.
Added feedback with two inputs example

An example has been added for creating a feedback system
with two inputs using the Octave control toolbox.
The inputs are *indicies* instead of names like all the
other functions.  Once that issue was resolved it was
fairly straightforward.