build: depend on 0.6.2.1+ swarm/thevoid
session: added ioflags/cflags URI parameters
config: added 2 group - default in elliptics example
io: put read_data() into try/catch block
io: return 404 in download-info if there is no given key, otherwise service unavailable
rift: updated naming scheme, use /handler/key?bucket=xxx&user=yyy