removing capybara default_wait_time to see if the db timeouts on travis disappear.
Revert "removing capybara default_wait_time to see if the db timeouts on travis disappear."

This reverts commit ba2393ed3f560b321a67c04e3660232296687ab8.
Raising the default_wait_time for admin/pages_contoller spec.
Uses a more thread safe version of connection pool sharing for capybara tests.
Break file names in attachment archive table.
Do not show tag sidebar in attachments archive, if there are no tags.