[misc] add --no-transfer-progress to all the mvn commands

Apparently `mvn clean` downloads all the packages when running
 `make package`.

services/git-bridge/Makefile

@@ -1,24 +1,25 @@
 # git-bridge makefile
 
+MVN_OPTS := "--no-transfer-progress"
 
 run: package
 	java -jar target/writelatex-git-bridge-1.0-SNAPSHOT-jar-with-dependencies.jar conf/local.json
 
 
 build:
-	mvn --no-transfer-progress package -DskipTests
+	mvn $(MVN_OPTS) package -DskipTests
 
 
 test:
-	mvn --no-transfer-progress test
+	mvn $(MVN_OPTS) test
 
 
 clean:
-	mvn clean
+	mvn $(MVN_OPTS) clean
 
 
 package: clean
-	mvn --no-transfer-progress package -DskipTests
+	mvn $(MVN_OPTS) package -DskipTests
 
 
 .PHONY: run package build clean test