Test building with only one thread for mybinder.

Signed-off-by: Andres Acosta <pipeacosta@gmail.com>

setup.py

@@ -37,7 +37,7 @@ def build_extension(self, ext):
             if self.parallel:
                 build_args = ['--', '-j' + str(self.parallel)]
             else:
-                build_args = ['--', '-j4']
+                build_args = ['--', '-j1']
 
         if not os.path.exists(self.build_temp):
             os.makedirs(self.build_temp)