Feature/jl/mie 670

https://ngjira.nationalgeographic.com/browse/MIE-670
REQUIRES:  https://github.com/natgeo/modules-activitystream/pull/4

- CHANGE:  Rename hostname from as.nationalgeographic.com to as.dev.nationalgeographic.com to be more in line with our dev environment standards.  
- CHANGE:  Source socket.io file from Bower
- NEW:  Hit new endpoint at root of AS host to obtain session auth cookie prior to establishing a socket connection

TO TEST:
- Ensure Redis is installed and running
- Update and start Activity Streams service
- Visit as.dev.nationalgeographic.com:9000
- View web console to ensure no errors are present that relate to contacting the AS endpoint or establishing a socket connection (see KNOWN ISSUES)
- View the AS server console to ensure you see entries like the following:
info: handshake authorized 6NKnStsGTO5QY0XiyKLJ
q:  MATCH (actor:mmdb_user)-[verb:FAVORITED]-(object)
WHERE actor.mmdb_user_id="1"
RETURN actor,verb,object p:  {}

KNOWN ISSUES:  The demo page for the module no longer renders anything and throws errors when trying to connect to MMDB and YS.  The main purpose for testing this code is to ensure that the socket to the AS service can be established from another "domain".  (NOTE:  The only difference in hosts between the module and the service is the port number, but this is enough of a difference for the service site)