Remove duplication in render function
Move toCSS out to a new class (still need to remove creation of that class from parser)
parser no longer needs to expose imports (they are on the parseTree) and can use a variable instead of a reference to itself
Parser does not need to have a parseEnv stored on itself
Remove some interdepedencies
move creation of env to invoker
move import manager creation out of parser
Parser no longer requires environment
seperate out the environments at the top-most-level