Added bin path to gdm call in case the GOPATH/bin folder is not on th…

…e users path.

build.py

@@ -465,7 +465,7 @@ def go_get(branch, update=False):
         run(get_command)
     print "Retrieving dependencies with `gdm`..."
     sys.stdout.flush()
-    run("gdm restore")
+    run("{}/bin/gdm restore".format(os.environ.get("GOPATH")))
 
 def generate_md5_from_file(path):
     m = hashlib.md5()