DOC: Add and reference Coding Style appendix.

Add a Coding Style chapter to the ITK SW Guide. The chapter is added as
an appendix.

The chapter is referenced from the "How To Create a Module" chapter.

Change-Id: I327583bd6a579a2947e6f1227b4528bd2b415b03

Author: Jon Haitz Legarreta

SoftwareGuide/Latex/AP01-Licenses.tex

@@ -1,6 +1,7 @@
 \chapter{Licenses}
 
 \section{Insight Toolkit License}
+\label{sec:InsightToolkitLicense}
 \verbatiminput{\ITKSOURCEDIR/LICENSE}