Installation guide now lets RC and EC self-pick XMPP user/password

closes #1066
Adds diagram to installation guide (closes #1011)
Require resource_factory lib by default
[Doc] Dev guide
Adds if_name property to wpa, hostapd, iw and wlan modules
Updates tests for WLAN resource with if_name property
Updated defApplication signature to simplify OEDL syntax
Merge remote-tracking branch 'jack/master'
Fixing the logic of configure wifi device by index
Need to use to_s to get experiment property value
Convert exp property object to string for opts hash deep merge
Merge remote-tracking branch 'thierry/app_proxy'
Merge branch 'master' of https://github.com/mytestbed/omf into doc
Working on #1046, creating new tutorial00 i.e a new Hello World