Eslint doesn't expect "module" scopes -- yet

When specifying "module" to escope sourceType option, defined variables
will be stored in "module" scope instead of the "global" scope. Because
eslint doesn't support module scopes yet, it will ignore this scope when
the rule "no-undef" gets the current scope to check for JSX variables
definitions.

Fixes babel#15 and babel#29

index.js

@@ -40,7 +40,6 @@ function monkeypatch() {
   var analyze = escope.analyze;
   escope.analyze = function (ast, opts) {
     opts.ecmaVersion = 6;
-    opts.sourceType = "module";
     return analyze.call(this, ast, opts)
   };
 }