Revert "Use json-1.8.2 to build successfully w/ Ruby >= 2.2"
Revert "Use json-1.8.2 to build successfully w/ Ruby >= 2.2"

This reverts commit 153b7da36edb1178b58f6e466dc76bfeb5401b57.

matschaffer/knife-solo,matschaffer/knife-solo,matschaffer/knife-solo