Bump to Rails 4.2.0 as that's the most recently supported Rails version

This solves issues with json 1.8.3 not compiling against Ruby 2.4.1 etc.

New version to drop the pessimistic upper-bound restriction on Active…

… Support and MultiJSON to prevent future gemfile resolution deadlocks

Release 2.6.3

Release 2.6.2

Release 2.6.1 with the cache_root! feature

Version 2.6.0

Version 2.5.0

Version 2.4.1

Version 2.4.0

Version 2.3.2