integration test with en-EN language

Tests fail on machines that default to other available languages.

Also move setting capybara driver to be javascript driver into the BrowserIntegrationTest.
make sure ticket get's cleared at end of tickets_by_admin test

Also relax the requirement from tickets.count > 1 to > 0. There is only one ticket if there have not been any others in the database ahead of time.
log failing integration tests with screenshot

* store the last screenshot in tmp
* store the html and the end of the server log in tmp

Filenames are build from the test class name and the tests name.
stop taking screenshot - will happen no failure autmatically now
Merge pull request #137 from azul/test/fix-red-ci

Test/fix red ci