Add created_at and created_by columns to series_sales table and fill them with default values.

Author: cssru

.travis.yml

@@ -18,7 +18,7 @@ addons:
 
 before_script:
   - if [ "$SPRING_PROFILES_ACTIVE" = 'travis' ]; then
-      mysql -u travis -e 'CREATE DATABASE mystamps CHARACTER SET utf8;';
+      mysql -u root -e 'CREATE DATABASE mystamps CHARACTER SET utf8;';
       if [ "$TRAVIS_BRANCH" = 'prod' ]; then
         pip install --user ansible;
       fi;