Add support of popping a list of values from the cache #6
Description
>>> request.cache.set('k1', 'v1')
>>> request.cache.pop(['k1', 'k2', 'k3'], defaults=['d1', 'd2', 'd3'])
['v1', 'd2', 'd3']
{{ message }}
>>> request.cache.set('k1', 'v1')
>>> request.cache.pop(['k1', 'k2', 'k3'], defaults=['d1', 'd2', 'd3'])
['v1', 'd2', 'd3']