I made the non-test seconds instead of ms, but not the test

This just replaces random bytes with macaroons. The macaroons are not
inspected by the client or server.

In particular, they claim to have an expiry time, but nothing verifies
that they have not expired.

Follow-up commits will actually enforce the expiration, and allow for
token refresh.

See https://bit.ly/matrix-auth for more information

Add and use cached batched storage.get_state function.

Federation for end-to-end key requests.

Simplify LoginHander and AuthHandler

Add a few strategic new lines to break up the on_query_client_keys and on_claim_client_keys methods in federation_server.py

Dictionary and list caches

Add some metrics about the reactor

Update to Twisted-15.2.1.