Use babylon parser directly to disable strict mode

We shouldn't assume that all JavaScript analyzed by this engine will
adhere to strict ES6 rules. Instead, use the parser as loosely as
possible when analyzing for duplication.

Author: dblandin

lib/cc/engine/analyzers/javascript/parser.js

@@ -1,4 +1,4 @@
-var babel = require('babel');
+var babylon = require("babylon");
 
 process.stdin.resume();
 
@@ -19,7 +19,7 @@ process.stdin.on('data', function(chunk) {
 });
 
 process.stdin.on('end', function() {
-  var ast = babel.transform(source).ast;
+  var ast = babylon.parse(source, { plugins: ["jsx"], strictMode: false, sourceType: "module" });
   var program = ast.program;
   console.log(
     JSON.stringify(format(program))

package.json

@@ -8,6 +8,6 @@
     "url": "[email protected]:codeclimate/codeclimate-duplication.git"
   },
   "dependencies": {
-    "babel": "^5.8.23"
+    "babylon": "^6.1.2"
   }
 }