add cask for vine-server

an OS X VNC server
update transmission to 2.77
update shortcat to version 0.3.13
Merge pull request #184 from darinmorrison/feature/shortcat-0.3.13

Shortcat 0.3.13
Added gas-mask cask
Merge pull request #185 from vitorgalvao/gas-mask-cask

Added gas-mask cask