ability to force colorizing the output

[jpastuszek]

When working with Jenkins or SSH colorization stops working due to standard output/error not being a terminal like output. Many terminal programs allow to force colorization of output in case one is used in environment that is not directly attached to terminal but has one attached remotely (e.g. via SSH) or has color codes handled in a special way (e.g. Jenkins plugin). This change adds function allowing to set color to true regardless if logger is used in a terminal or not.