Create a folder with a specified "name" attribute.
			folder_id allows to specify a parent folder.

def mkdir(self, name=None, folder_id='0'):
		'''Create a folder with a specified "name" attribute.
			folder_id allows to specify a parent folder.'''
		return self( 'folders', method='post', encode='json',
			data=dict(name=name, parent=dict(id=folder_id)) )