Display Exercises in landscape when needed

The exercises (like quiz) are not view-able completely in portrait and landscape view. It is view-able in landscape mode only in Tablet.

This was tested in:
1. Samsung Tab 2, Samsung Galaxy Grand, Iphone 4S - Android 4.1/ Android 4.2 / iOS 5 on Mobile Handset.
2. Iphone 5, 5S, iPad 3 (6), iPad 3 (7), 6. Nexus 7 - iOS 6 & 7 on Browser stack

Steps:
1. Go to : http://next.dev.curriki.org/xwiki/bin/view/Coll_Group_CurrikiGeometry/KhanQuizzes?skin=respurriki
2. Select an Exercise
3. Select topic Finding Volume or Points, Lines, Planes