Adding a simple play area 
Adding a simple play area 

for trying out expressions and seeing how they
evaluate
dtao/doctrine,petebacondarwin/doctrine,jifeon/doctrine,ecomfe/doctrine2,PolymerLabs/doctrine,googlearchive/doctrine,Constellation/doctrine,PolymerLabs/doctrine,googlearchive/doctrine,demands/doctrine,Constellation/doctrine,mysticatea/doctrine,ecomfe/doctrine2,jifeon/doctrine,mysticatea/doctrine,aeisenberg/doctrine,jonathanKingston/doctrine,fivetran/doctrine