Fixed issue with branch detection for PRs

tests/ci_git_prep.sh

@@ -1,6 +1,27 @@
 #!/bin/sh
-
+echo "Travis thinks the branch is $TRAVIS_BRANCH"
 git config --global user.email "travis@travis-ci.org"
 git config --global user.name "Travis CI"
 git checkout $TRAVIS_BRANCH
 exit 0
+
+
+git_setup() {
+  git config user.email "travis@travis-ci.org"
+  git config user.name "Travis CI"
+}
+
+detect_branch() {
+  if [ "$TRAVIS_PULL_REQUEST" = "true" ]; then
+    echo $TRAVIS_PULL_REQUEST_BRANCH
+  else
+    echo $TRAVIS_BRANCH
+  fi
+}
+
+CURRENT_BRANCH=$(detect_branch)
+
+git_setup
+git checkout $CURRENT_BRANCH
+export $CURRENT_BRANCH
+exit 0