Fixed link error due to using refs to static const

[novitk]

solves the linker issue is with references to "static consts" without creating a cpp file, by creating refs locally
For detailed description, see https://stackoverflow.com/questions/16957458/static-const-in-c-class-undefined-reference for details

[boring-cyborg]

Thanks for opening this pull request! It might take a while before we look at it, so don't worry if there seems to be no feedback. We'll get to it.

[CLAassistant]

All committers have signed the CLA.

[coveralls]

Coverage remained the same at 71.174% when pulling 5b88afa on novitk:master into 9087e73 on lballabio:master.

[lballabio]

Thanks!

[boring-cyborg]

Congratulations on your first merged pull request!