[Engine] Only log config related calls if CONFIG_DEBUG is defined

This reduces log noise and also prevents logging potentially sensitive data
like passwords.
Merge branch 'stable'
[Frontend-GNOME] Fixed compile error in IndicateManager for release builds
[Build] Added Travis CI build script
[Build] Silence apt-get update
[Build] run autogen.sh for Defines.cs
[Build] Install all build-deps of smuxi
[Build] On Ubuntu 12.04 (precise) we have to use dmcs instead of gmcs
[Build] Removed obsolete Packages project files
[Frontend-STFL-Tests] Don't require a specific NUnit version
Merge branch 'stable'

Conflicts:
	src/Frontend-GNOME/IndicateManager.cs
[Engine-XMPP] Removed jabber-net2005 and moved to agsXMPP
[Engine-XMPP] Resources and Priorities are now properly supported
[Engine-XMPP] Disable MUC until fully loaded. Open Contactchat on reconnect. Allow custom away messages. Remove outdated comments.
[Engine-XMPP] Engine doesn't crash with old frontends anymore.
[Engine-XMPP] Can now connect through a proxy
[Engine-XMPP] Refactored Reconnect. It now does a clean reconnect and doesn't crash anymore due to internal socket stuff.
[Engine-XMPP] enabled parsing of html messages
[Engine-XMPP] automatically open private chat window when contact starts typing instead of waiting for first actual message