Drop database before trying to create

Signed-off-by: Michal Čihař <michal@cihar.com>

shippable.yml

@@ -26,6 +26,7 @@ install:
   - pip install --download-cache $HOME/.pip-cache unittest-xml-reporting
 # create databases
 before_script:
+  - mysql -e 'DROP DATABASE IF EXISTS weblate;'
   - mysql -e 'CREATE DATABASE weblate CHARACTER SET utf8 COLLATE utf8_general_ci;'
   - psql -c 'create database weblate;' -U postgres
   - if [ -n "$DO_SELENIUM" ] ; then curl -L https://gist.githubusercontent.com/santiycr/5139565/raw/sauce_connect_setup.sh | bash ; fi