Fixed a typo from 'strftime' to 'strptime' in Historic initializer
Merge tag '2.1.0.beta' into develop

Adding beta Managed Sources support
Add BSD License to .gemspec. Resolves #40
Removed JSON gem in favor of Yajl-Ruby. Resolves #41
Final fixes for v.2.1.0 release
Bumped to v.2.1.0
Merge pull request #43 from datasift/feature/2.1.0

Feature/2.1.0
Merge pull request #37 from bobbymartinez/patch-1

Fixed a typo from 'strftime' to 'strptime' in Historic initializer
Merge branch 'release/2.1.0'