Replace json codec with agnostic multi_json #1026
Add optional json codecs to generated Gemfile
Use yajl only for mri
Merge pull request #1029 from ujifgc/multi-json

Replace json codec with agnostic multi_json #1026
Merge remote-tracking branch 'upstream/master' into super-admin
Merge branch 'super-admin' of github.com:WaYdotNET/padrino-framework into super-admin