Bumped version to 0.9.0
Moved version guard for ActiveSupport into Gemfile for sanity etc
Removed extra whitespace
Added require for Date class, added spec for #get_orders_by_date. Fixes #62
Merge pull request #63 from sgerrand/require-date

Adds missing require for Date class in Bigcommerce::Api
Merge pull request #61 from sgerrand/release-0.9.0

Increments version to 0.9.0