Support for es6 re-export syntax (#91)

* Add support for re-export syntax

e.g.:

export { a } from './a'k
export a from './a'
export * as a from './a'

* update npm-shrinkwrap.json

* should should -> should, ^1.1.5 -> 1.1.5

lib/parse/es6.js

@@ -38,7 +38,7 @@ ES6.prototype.parseFile = function (filename) {
 
 			this.emit('parseFile', fileData);
 
-			if (/import.*from/m.test(fileData.src)) {
+			if (/import.*from/m.test(fileData.src) || /export.*from/m.test(fileData.src)) {
 				detective(fileData.src).map(function (id) {
 					var depFilename = this.resolve(path.dirname(fileData.filename), id);
 					if (depFilename) {

package.json

@@ -30,7 +30,7 @@
     "commander": "^2.8.1",
     "commondir": "^1.0.1",
     "detective": "^4.2.0",
-    "detective-es6": "1.1.4",
+    "detective-es6": "1.1.5",
     "graphviz": "0.0.8",
     "react-tools": "^0.13.3",
     "resolve": "^1.1.6",

test/es6.js

@@ -45,9 +45,15 @@ describe('module format (ES6)', function () {
     }).obj().should.eql({ 'jsx': [ 'absolute/b' ] });
   });
 
-  it('should should find imports on files with ES7', function() {
+  it('should find imports on files with ES7', function() {
     madge([__dirname + '/files/es6/async.js'], {
       format: 'es6'
     }).obj().should.eql({ 'async': [ 'absolute/b' ] });
   });
+
+  it('should support export x from "./file"', function() {
+    madge([__dirname + '/files/es6/re-export'], {
+      format: 'es6'
+    }).obj().should.eql({ 'a': [], 'b-default': ['a'], 'b-named': ['a'], 'b-star': ['a'], 'c': ['b-default', 'b-named', 'b-star'] });
+  });
 });

test/files/es6/re-export/a.js

@@ -0,0 +1,2 @@
+export default 'default export value';
+export const named = 'named';

test/files/es6/re-export/b-default.js

@@ -0,0 +1 @@
+export someDefault from './a'

test/files/es6/re-export/b-named.js

@@ -0,0 +1 @@
+export { named } from './a';

test/files/es6/re-export/b-star.js

@@ -0,0 +1 @@
+export * from './a'

test/files/es6/re-export/c.js

@@ -0,0 +1,3 @@
+import { named } from './b-named'
+import { someDefault } from './b-default'
+import star from './b-star'