Colorful support for terminal

---------------------

Color

color as function:

``javascript
var color = require('colorful').color
color.red('hello')
color.underline('hello')
`

color as human:

`javascript
require('colorful').colorful()
'hello'.to.red.color
'hello'.to.underline.bold.red.color
`

color and style supports:

- black black_bg
- red red_bg
- green green_bg
- yellow yellow_bg
- blue blue_bg
- magenta magenta_bg
- cyan cyan_bg
- white white_bg
- gray grey gray_bg grey_bg
- bold
- italic
- underline
- blink
- inverse
- strike

and detect is color supported:

`javascript
require('colorful').color.isSupported
``

Logging

Colorful and nested logging support.