Updated likes methods to support before and after filters
Updated oauth library to 0.2.0
Enforced simple_oauth ~> 0.2.0 as a dependency
Updated versioning
Revert "Enforced simple_oauth ~> 0.2.0 as a dependency"

This reverts commit 0f9a4b160540edf2397631ce956067f035cfe4b2.
Revert "Updated oauth library to 0.2.0"

This reverts commit ff94c8399d86bf790be8614f3404d964abf76e02.
Revert "Updated versioning"

This reverts commit 31754c929a87077f9f288a4f8c9a132bb4fd04fb.
updated user agent string
Merge pull request #43 from tumblr/likes-before-after

Updated library to support the new before and after parameters for likes