(#144) Adding caching support in AppVeyor.yml
(#144) Adding caching support in AppVeyor.yml

- Adding caching of the Source\packages folder so that these don't have to be downloaded each time the build happens.

paladique/ChocolateyGUI,chocolatey/ChocolateyGUI,gep13/ChocolateyGUI,wjk/ChocolateyGUI,chocolatey/ChocolateyGUI,dlsteuer/ChocolateyGUI,gep13/ChocolateyGUI,chocolatey/ChocolateyGUI,chocolatey/ChocolateyGUI,M-Zuber/ChocolateyGUI,alephnaughty/ChocolateyGUI,paladique/ChocolateyGUI,RichiCoder1/ChocolateyGUI,gep13/ChocolateyGUI,gep13/ChocolateyGUI,sayedihashimi/ChocolateyGUI,gep13/ChocolateyGUI,chocolatey/ChocolateyGUI,digital-carver/ChocolateyGUI