Script tests re-added, all tests can run under gdb

Also fixed a minor bug with printing, and removed the ability to
configure the parser.

Added and updated QUICKSTART.md as a quick way to get people started.

There's some broken scripts under 'scripts/' that require functions to
work properly.

tests/scripts/test_scopes.toy

@@ -0,0 +1,17 @@
+//shadowing
+var answer = 42;
+print answer; //42
+{
+	var answer = 7;
+	print answer; //7
+}
+print answer; //42
+
+//rebinding
+var question = 42;
+print question; //42
+{
+	var question = question;
+	print question; //42
+}
+print question; //42