Import colorama for color coded text on windows

[danielbair]

If you import the python module 'colorama' you don't need to check for 'is_posix' when printing to the terminal, and this would also enable windows machines to get colored information/diagnostics text display.

https://pypi.python.org/pypi/colorama

[readbeyond]

Thanks for the suggestion, this issue will be dealt with in v2.

I would actually like to keep the current dependencies as minimal as possible. Since aeneas is not really producing many colored messages (basically: normal, OK/WARNING/ERROR), maybe I will look into the colorama source, and package appropriate functions inside globalfunctions, or move there code that is currently duplicated in user-facing scripts.