rib: Fix to correctly set default expiration for self-registrations

Change-Id: I598fc8b0395118156fe2f394798b9ee846348c4f
Refs: #1772
rib: Fixing bug with RibUnregister when route origin is not specified

Change-Id: Ica250a1c45ed42f1dc7862a12916f893fa846312
Refs: #1773
build: Fix bug in instructions to get websocketpp library

Change-Id: I7eb7585a67cd738768b31b51298852ea380d5a04
Merge remote-tracking branch 'named-data/master' into release-0.2.0

Change-Id: I5c62c7de04027d40f083c871d6d5b6f42a6f8965