Initialize git flow

Author: daniel-shuy

.travis.yml

@@ -30,7 +30,14 @@ jobs:
         - wget --no-check-certificate -q  https://raw.githubusercontent.com/petervanderdoes/gitflow-avh/develop/contrib/gitflow-installer.sh
         - sudo bash gitflow-installer.sh install stable
       install:
-        - git checkout -qf $TRAVIS_BRANCH
+        - git remote set-branches --add origin master
+        - git remote set-branches --add origin develop
+        - git fetch origin
+        - git checkout --force -b master --track origin/master
+        - git checkout --force -b develop --track origin/develop
+        - git checkout --force $TRAVIS_BRANCH
+        - git config gitflow.prefix.release release/
+        - git flow init --defaults
       before_script: git remote set-url origin https://[email protected]/$TRAVIS_REPO_SLUG.git
       script: sbt "^ release release-version $RELEASE_VERSION with-defaults"
       # --message option is required to suppress editor prompt