Updated commonsense-gwt-lib to handle empty reponses from CommonSense
API
Updated welcome page
Created simple login form without outdated welcome panel
Conflicts:
	src/nl/sense_os/commonsense/login/client/LoginClientFactoryImpl.java
	src/nl/sense_os/commonsense/login/client/login/LoginActivity.java
	src/nl/sense_os/commonsense/login/client/login/LoginView.java
Removed help entry from header
Changed library columns: hide environment column by default, show
description column
Improved navigation bar: removed dashboard link, added dev portal, added
home