.travis.yml: quote user/host to fix "ERROR 1046 (3D000): No database selected" error.

I hope that helps.

Addressed to #612

Author: php-coder

.travis.yml

@@ -12,7 +12,7 @@ before_script:
   - set -o errexit # exit immediately when commands return a non-zero status
   - if [ "$SPRING_PROFILES_ACTIVE" = 'travis' ]; then
       mysql -u root -e 'CREATE DATABASE mystamps CHARACTER SET utf8;';
-      mysql -u root -e 'GRANT ALL PRIVILEGES ON mystamps@* TO travis@%;';
+      mysql -u root -e "GRANT ALL PRIVILEGES ON mystamps@* TO 'travis'@'%';";
       mkdir -p /tmp/uploads /tmp/preview;
       cp src/main/resources/test/test.png /tmp/uploads/1.png;
       if [ "$TRAVIS_BRANCH" = 'prod' -a "$TRAVIS_PULL_REQUEST" = 'false' ]; then