superclass missing interface function
another fn missing in superclass
simplify so error msgs are readable without middleware
cleanup
bump version
if has been implemented a while ago
fixed typos
first environment unit tests
fix IfNode children not recieving the environment 

after the parsing process, the environment is set on all
nodelists and the nodelists are responsible for setting it on
their children. This didn't work for the IfNode: it is special because 
it has lots of children nodelists, which aren't directly attached to the node but hidden in an array of [condition, nodelist]
Merge pull request #1 from grob/patch-1

fixed typos
bump version