Swift 3.1 Warning for 'M_PI_2' is deprecated:

[sashalondon]

Upgraded to Swift 3.1 I get warnings: 'M_PI_2' is deprecated: Please use 'Double.pi / 2' or '.pi / 2' to get the value of correct type and avoid casting.

I have solved it with Double.pi / 2 as it says.

Just to solve it to remove the warning.

[niennonno]

#79

Added the changes, waiting for merge.