Added script SignTargetFiles.js for signing output EXE and DLL files.

This script is for automatic signing of output files generated by Visual
Studio with given PFX file. Useful in post-build event. See Doxygen
comments in file for more information.
Added script RevAssemblyInfo.js which puts SVN revision into assembly version.

This script incorporates SVN revision information into Visual C# project
by generation of helper class and altering AssemblyFileVersion. Useful
in pre-build event. See Doxygen comments in file for more information.