Lab: State Machines

Cover state machines as a precursor to regular expressions.
added section on NFAs

introduced regular expressions
clarified regexes

Sometimes a dfa simulation is easier to code and debug than a regular
expression.
add illustration of regex

also fixed a few other minor issues
Merge branch 'develop' into dfa

Conflicts:
	Vol3.tex
begin combining labs with RegexBasic

Combining with basic regular expressions.

Added section on regular expressions in Python.
begin application of regular expressions

List the most regular expression operations.
Merge branch 'develop' into dfa
reword some sentences to be more clear.
Merge branch 'develop' into dfa

Conflicts:
	Vol3.tex
added table of regex syntax

other minor fixes
move state machine lab to Python

Lab is not really an algorithm, but more a programming specific lab.
update Volume 3
label the table of regex chars
Corrections and Clarifications to the ODE labs in Vol4
A simple typo fix.
Fixed a formula error and removed a problem that would be hard to grade.
Cleared up a notational conflict on how to apply the initial conditions
and how to apply different higher-order ODE solving methods.
Added a *very* brief explanation tying the IVP solving methods to
numerical quadrature.
Merge branch 'master' into ivp