Removing activesupport dependency. #21

I18n (dependency of activesupport) prints a deprecation message
when enforce_available_locales is not configured, which is annoying
for apps not using I18n. Since we are only using activesupports'
Array#extract_options! method we decided to inline it into bcdatabase
and remove the activesupport dependency.
Merge pull request #21 from NUBIC/21-remove_activesupport_dependency

Removing activesupport dependency. #21