Can now get contents via sync method

Uses most of pull request from @dhcole and closes #46
To avoid code duplication though, sync has been added as an extra param,
instead of new function

Author: mattpass

README.md

@@ -49,10 +49,10 @@ Show repository information
 repo.show(function(err, repo) {});
 ```
 
-Get contents at a particular path in a particular branch.
+Get contents at a particular path in a particular branch. Set sync to true to get contents via sync method.
 
 ```js
-repo.contents("master", "path/to/dir", function(err, contents) {});
+repo.contents(branch, "path/to/dir", function(err, contents) {}, sync);
 ```
 
 Fork repository. This operation runs asynchronously. You may want to poll for `repo.contents` until the forked repo is ready.

github.js

@@ -33,7 +33,7 @@
     //
     // I'm not proud of this and neither should you be if you were responsible for the XMLHttpRequest spec.
 
-    function _request(method, path, data, cb, raw) {
+    function _request(method, path, data, cb, raw, sync) {
       function getURL() {
         var url = API_URL + path;
         return url + ((/\?/).test(url) ? "&" : "?") + (new Date()).getTime();
@@ -42,13 +42,15 @@
       var xhr = new XMLHttpRequest();
       if (!raw) {xhr.dataType = "json";}
 
-      xhr.open(method, getURL());
-      xhr.onreadystatechange = function () {
-        if (this.readyState == 4) {
-          if (this.status >= 200 && this.status < 300 || this.status === 304) {
-            cb(null, raw ? this.responseText : this.responseText ? JSON.parse(this.responseText) : true);
-          } else {
-            cb({request: this, error: this.status});
+      xhr.open(method, getURL(), !sync);
+      if (!sync) {
+        xhr.onreadystatechange = function () {
+          if (this.readyState == 4) {
+            if (this.status >= 200 && this.status < 300 || this.status === 304) {
+              cb(null, raw ? this.responseText : this.responseText ? JSON.parse(this.responseText) : true);
+            } else {
+              cb({request: this, error: this.status});
+            }
           }
         }
       };
@@ -61,6 +63,7 @@
            );
          }
       data ? xhr.send(JSON.stringify(data)) : xhr.send();
+      if (sync) return xhr.response;
     }
 
 
@@ -343,8 +346,8 @@
       // Get contents
       // --------
 
-      this.contents = function(branch, path, cb) {
-        _request("GET", repoPath + "/contents?ref=" + branch + (path ? "&path=" + path : ""), null, cb, 'raw');
+      this.contents = function(branch, path, cb, sync) {
+        return _request("GET", repoPath + "/contents?ref=" + branch + (path ? "&path=" + path : ""), null, cb, 'raw', sync);
       };
 
       // Fork repository