Use Circle CI for faster builds. (#181)

Move to Circle CI from Travis CI.

tests/generate_tests.sh

@@ -1,16 +1,10 @@
 #!/bin/sh
 
 
-if [ "$TRAVIS_EVENT_TYPE" = "cron" ] || [ ! -z $DEV ] ; then
-		echo "Travis event type is: $TRAVIS_EVENT_TYPE"
+if [ "$EVENT_TYPE" = "cron" ] || [ ! -z $DEV ] ; then
+		echo "Event type is: $EVENT_TYPE"
 		echo "This is a development version build: $DEV"
 		TAG="rolling"
-else
-		if [ "$TRAVIS_BRANCH" = "master" ]; then
-				TAG="latest"
-		else
-				TAG="$TRAVIS_BRANCH"
-		fi
 fi
 
 
@@ -19,10 +13,10 @@ version: '2'
 
 services:
   mailman-core:
-    image: maxking/mailman-core:$TAG
+    image: ${!REG_URL}/maxking/mailman-core:$TAG
 
   mailman-web:
-    image: maxking/mailman-web:$TAG
+    image: ${!REG_URL}/maxking/mailman-web:$TAG
     environment:
     - SECRET_KEY=abcdefghijklmnopqrstuv
 EOF