Added subheader to Learning Objectives page

Added the subhead to the Learning Objectives page
LO icon linked to active tab
files deleted

Several files deleted
Started on condition subtab on Learning Objectives page
Merge remote-tracking branch 'origin/master'

Conflicts:
	grails-app/views/imod/create.gsp
	grails-app/views/learningObjective/_learning_objectives_main.gsp
	web-app/css/source/imod.css