Remove the oldest snapshot version from the manifest

Author: briancroom

manifest.yml

@@ -10,12 +10,6 @@ url_to_dependency_map:
     version: $1
 
 dependencies:
-  - name: swift
-    version: 2.2-SNAPSHOT-2015-12-01-b
-    uri: https://swift.org/builds/ubuntu1404/swift-2.2-SNAPSHOT-2015-12-01-b/swift-2.2-SNAPSHOT-2015-12-01-b-ubuntu14.04.tar.gz
-    md5: a93f52921c491b747cad256904c8742f
-    cf_stacks:
-      - cflinuxfs2
   - name: swift
     version: 2.2-SNAPSHOT-2015-12-10-a
     uri: https://swift.org/builds/ubuntu1404/swift-2.2-SNAPSHOT-2015-12-10-a/swift-2.2-SNAPSHOT-2015-12-10-a-ubuntu14.04.tar.gz