width of sentence area, sentence render
small layout changes to activity box
student management layout
Student Management layout
Merge branch 'dev' of https://github.com/peachproductions/unitsofsound into dev

Conflicts:
	src/com/peach/uofs/components/teacher/Background.mxml
	src/com/peach/uofs/components/teacher/ListOfStudents.mxml
	src/com/peach/uofs/lesson/ActivityBox.mxml
	src/com/peach/uofs/lesson/ModuleLesson.mxml
	src/index.mxml