static const EPS changed to method.

http://stackoverflow.com/questions/370283/why-cant-i-have-a-non-integral-static-const-member-in-a-class
Merge pull request #1121 from efim/master

static const EPS changed to method.
Corrected robot rotational behaviour
Merge branch 'master' of github.com:qreal/qreal into robots

Conflicts:
	qrutils/mathUtils/math.cpp
	qrutils/mathUtils/math.h