add comments to intro emit multimethod
add detect-form test
add sym->property test
add emit-delimted test
add emit-map test
add docstring to emit-map
add emit-set docstring
add emit-set test
add emit-vector docstring
add comment to intro Chlorine symbols and Javascript equivalents
add docstring to emit-symbol
add docstring to emit-keyword
add comment to introduce native operators
remove `not=` from infix operators (should be in core library instead)
add docstring to emit-function call
add docstring to emit-invoke-function
add docstring to emit-method-call
add comment to introduce *return-expr*
add docstring to with-return-expr
add docstring and comments to emit-function-form