Initial commit
Add more operators, boolean Literals, and more tests.
Start the CustomBindingSyntax implementation.
Small clean up on Binding.
Add codereview.settings
Initial commit
Add index operator.
Address review comments. Add helpers for tests. Fix parsing boolean literals.
Merge branch 'review'

Conflicts:
	.gitignore
	example/example.dart
	example/example.html
	lib/eval.dart
	lib/expression.dart
	lib/parser.dart
	pubspec.yaml
	test/all_tests.dart
	test/eval_test.dart
	test/parser_test.dart
	test/tokenizer_test.dart
Conflicts:
	lib/eval.dart
	lib/parser.dart
	test/eval_test.dart
	test/parser_test.dart