Wrote grammar for really basic arrays and array access.
Implemented basic arrays and array access in evaluator.
Wrote test7 to test arrays.
Completely rewrote array and accessor grammar.
Rewrote array evaluation and got accessors working correctly.
Added more tests to test7 to make sure arrays and accessors work properly.
Fixed weird syntax errors by amending grammar.
Wrote proper syntax error logging code.
Fixed errors on undefined array index.
Fixed left expression grammar causing syntax errors.