Travis: update .travis/build.sh

Author: tpietzsch

.travis/build.sh

@@ -1,10 +1,3 @@
 #!/bin/sh
-dir="$(dirname "$0")"
-if [ "$TRAVIS_SECURE_ENV_VARS" = true \
-  -a "$TRAVIS_PULL_REQUEST" = false \
-  -a "$TRAVIS_BRANCH" = master ]
-then
-  mvn -Pdeploy-to-imagej deploy --settings "$dir/settings.xml"
-else
-  mvn install
-fi
+curl -fsLO https://raw.githubusercontent.com/scijava/scijava-scripts/master/travis-build.sh
+sh travis-build.sh