Updating comment on fmap function.
Separating proimsify into separate files
Updating built files to latest version
Adding tests for VarMap
Tidying up README.md "Is this practical?" section
Fixing typo in test name
Renaming VarMap#stepIn to VarMap#branch
Ensuring variables created in branched VarMap are appropriately created in original VarMap
Removing pause from build batch file
Initial version of FunctionExpression and CallExpression
Adding missing return statements to CallExpression