Rotation is a fundamental movement pattern in our every-day activities.
Whether we play Spin The Bottle at our next birthday, change our keyboard layout regularly, or do a sumersault to roll back into bed after our hair of the dog, we all regularly rely on rotation.
Thus also apply this principle to chart labels.
All credits go to http://www.d3noob.org/2013/01/how-to-rotate-text-labels-for-x-axis-of.html
Closes T16013