See #244

Fix #244.

See #244. [skip ci]

See #244.

Fix #254

Check if the output supports colors, see #244

This avoids using colors when the output is, e.g., redirected to a
file. This requried a change to avoid passing the `--colour` flag to
shake (so that hadrian is in charge of colors).

Signed-off-by: Michal Terepeta <michal.terepeta@gmail.com>

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See #245. [skip ci]

See #56, #245.

See #239.

See #245.

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See #220.