Gets file contents
		Args:
			file_key		key for the file 
			return			(status code, ?)

def get_file_contents(self, file_key):
		'''Gets file contents
		Args:
			file_key		key for the file 
			return			(status code, ?)
		'''
		#does not work
		self._raise_unimplemented_error()
		
		uri = '/'.join([self.api_uri,
						self.files_suffix,
						file_key,
						self.file_contents_suffix,
						])
		return self._req('get', uri)