Removed Teacher for Participant
Enhanced TimetableBean
Fixed ActivityTest

Not competely fixed...
Redesigned index.html
Merge remote-tracking branch 'origin/master'

Conflicts:
	src/main/java/timetable/beans/TimetableBean.java
	src/main/webapp/index.xhtml
Merge branch 'master' of https://github.com/ironmen-swp/timetable

Conflicts:
	src/main/java/timetable/beans/TimetableBean.java
	src/main/webapp/index.xhtml