Have MemoryDataStore's get_rooms_for_user_where_membership_is() return room membership event objects, as per interface contract

Handle call events in the recents view as well to get consistency with what it displays when refreshed.

Just show 'Call' for call events. Don't just splat out the content of the event for other events: it's rarely going to be sesnible.

Rename 'state' presence key to the much more obvious 'presence'; maintain a legacy 'state' copy for now

Fleshed out joining/leaving rooms. Added M_LIMIT_EXCEEDED standard error code for rate limited requests.

Added /web folder which contains html/css (based off the default swagger-ui) for viewing the c-s json api.

BF: Pass desired_user_id to register API. And update the app header to avoid to display the previous matrix id

change the world: make the default matrix API URL prefix /_matrix rather than /matrix to make it easier for existing websites to mount a HS in their namespace without collisions.

perl -pi -e 's#/matrix#/_matrix#g' ./cmdclient/console.py ./docs/client-server/howto.rst ./docs/client-server/specification.rst ./docs/client-server/swagger_matrix/directory ./docs/client-server/swagger_matrix/events ./docs/client-server/swagger_matrix/login ./docs/client-server/swagger_matrix/presence ./docs/client-server/swagger_matrix/profile ./docs/client-server/swagger_matrix/registration ./docs/client-server/swagger_matrix/rooms ./docs/server-server/specification.rst ./graph/graph.py ./jsfiddles/create_room_send_msg/demo.js ./jsfiddles/event_stream/demo.js ./jsfiddles/example_app/demo.js ./jsfiddles/register_login/demo.js ./jsfiddles/room_memberships/demo.js ./synapse/api/urls.py ./tests/federation/test_federation.py ./tests/handlers/test_presence.py ./tests/handlers/test_typing.py ./tests/rest/test_events.py ./tests/rest/test_presence.py ./tests/rest/test_profile.py ./tests/rest/test_rooms.py ./webclient/components/fileUpload/file-upload-service.js ./webclient/components/matrix/matrix-service.js

 - add a simple CSS template across the app for navigation & cosmetics
 - split login into login & register, and totally reskin it
 - restructure room CSS to play nicely with it
 - implement basis 1:1 chat from user pages
 - disable autofocus on iOS to improve UX