Added possibility to specify elastic search settings from Bungiesearch's
settings. Tested locally. Did not find a good way to automatically test
that (because the settings are efficiently read only once). You can test
by setting `'use_ssl'` to `True` and if your ES instance doesn't allow
it, it should raise a ConnectionError.
Merge pull request #46 from Sparrho/issue-45

Added possibility to specify elastic search settings from Bungiesearch's