(#923) Remove custom build logic
(#923) Remove custom build logic

Previously, in order to use Cake.Recipe, there were lots of custom
build logic added to the recipe.cake file to do things like sign
assemblies, generate an MSI, etc.

All of these features now exist within the Chocolatey.Cake.Recipe and
can be controlled via parameters passed in via the recipe.cake file.
As a result, we don't need this custom logic in place, which makes the
recipe.cake file much simpler, as all it has to do now is to say what
files need to be processed, rather than actually having to do the work.

chocolatey/ChocolateyGUI,gep13/ChocolateyGUI,chocolatey/ChocolateyGUI,gep13/ChocolateyGUI,chocolatey/ChocolateyGUI,gep13/ChocolateyGUI,gep13/ChocolateyGUI,gep13/ChocolateyGUI,chocolatey/ChocolateyGUI,chocolatey/ChocolateyGUI