rename github account to vivien
bin: smarter coloring

Similiar to Git, the color is disabled is the standard output is not a
tty, but the --color (or --no-color) option has priority.

This means that we have the following behavior:

    $ notes               # color
    $ notes --no-color    # no color
    $ notes | cat         # no color
    $ notes --color | cat # color
bump version 0.1.2