bumped version to 0.4
starting on revamped grammar
predefs and 'function' working
'def' working
'locals' removed from new grammar
'class' working
fixed referencing environment bug and added example to README
fixed example in README
'method' working
working on 'import'
removed literal only restriction on alternatives
'import' working and with better syntax
'var' put back
'val' put back with fix to record destructuring binding
'export' removed as keyword
remove module name from VariableExprAST
implemented ? predicate
fixed result value printing in REPL and 'val' stores ConstantReference objects
REPL fix
fixed test programs