Fix TypeError when printing color codes to stdout

[Pawka]

TypeError exception is thrown when str() function treats terminal color code (e.g. \033[33m) as UTF-8:

In [2]: str("\033[33m", "utf-8", "replace")
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-2-54259ae346a9> in <module>()
----> 1 str("\033[33m", "utf-8", "replace")

TypeError: decoding str is not supported

Resolves #125 #139 #115 #101

[lorenzodifuccia]

Approved #145