Remove ansi colours escape codes in output

[cursork]

This removes ANSI escape sequences from standard output and error.

Reasons I've hit for stdout/stderr being coloured:

• Test runner may colour output
• "pretty" printed logs when in development mode
• Some middleware may also do it (e.g.: io.aviso.exception )

So far I've avoided disabling colours in each of these cases, as they are useful when using the REPL in the terminal.