Loosen constraint on 4.1.0.rc2 to be >=4.1.0.rc2
Fix DEFAULT_ENV

DEFAULT_ENV moved from ActiveRecord::Base to
ActiveRecord::ConnectionHandling in 4.1.
Update dependency to 4.1.0

Specifically:
  'activerecord', '>=4.1.0'
Merge pull request #194 from justin808/ar_4.1.x

Loosen constraint on 4.1.0.rc2