Revert "Changed it so it used the master branch to check for updates."

This reverts commit 5f09d64be07afe0989e1e24f2010104caad73763.
Revert "Added support for KSP-AVC version checking."

This reverts commit 014c65a3a620e5854c0bfcaf4bf39ba493b5de46.
Revert "Revert "Added support for KSP-AVC version checking.""

This reverts commit 21dccccf549f5a182f707faeaaf8eedd9c5c7931.
Revert "Revert "Changed it so it used the master branch to check for updates.""

This reverts commit dd84b05bda3d08a2e2d7f75d23657f74e9d6530d.