(#195) Adding Gitter Notification
(#195) Adding Gitter Notification

Based on information here:
http://www.appveyor.com/docs/notifications#webhooks
Trying to set up Gitter notifications about build succeeding and failing
M-Zuber/ChocolateyGUI,digital-carver/ChocolateyGUI,paladique/ChocolateyGUI,chocolatey/ChocolateyGUI,paladique/ChocolateyGUI,chocolatey/ChocolateyGUI,gep13/ChocolateyGUI,gep13/ChocolateyGUI,gep13/ChocolateyGUI,RichiCoder1/ChocolateyGUI,gep13/ChocolateyGUI,sayedihashimi/ChocolateyGUI,chocolatey/ChocolateyGUI,chocolatey/ChocolateyGUI,chocolatey/ChocolateyGUI,dlsteuer/ChocolateyGUI,wjk/ChocolateyGUI,alephnaughty/ChocolateyGUI,gep13/ChocolateyGUI