Return a list of branches for given repository

		:return: [str]

def branches(self):
		"""Return a list of branches for given repository

		:return: [str]
		"""
		req_message = 'https://api.bitbucket.org/1.0/repositories/' + self.reponame + '/branches'
		response_data = self._bitbucketAPIRequest(req_message)
		return response_data.keys()