Adding configuration option (--ndnx=PATH) to specify which ndnx should be used during runtime

Change-Id: I353655cff033e849cf299159794e62d2613569d7
Delegate for Preferences Panel is added

Change-Id: I1c2d1821626d9344e116d57b4867fe5166bb0d70
Face registration from Preferences Panel working

Change-Id: I06702d9e46a61353f0b957851d7eabc16fb3315c
Enabling autostart option using LaunchAtLoginController.

Also in this commit: fixing layout constraints in .xib file

Change-Id: Icd0d5ec8b663e909c5bb57c050382b1ff68eb016
Misc UI updates

Change-Id: I52540f8fbdceddcdf991ca3758fd1061a76166e0