Support clint.textui.max_width as context manager

[wkentaro]

issue: #2

#!/usr/bin/env python
# -*- coding: utf-8 -*-

from clint.textui import puts, max_width, indent

with max_width(6):
    puts('Hello world')

with max_width(20):
    puts('Hello world')

with indent(4):
    with max_width(6):
        puts('Hello world')

with max_width(20):
    puts('Hello world')
    with max_width(6):
        puts('Hello world')
    puts('Hello world')

to get output::

Hello
world
Hello world
    Hello
    world
Hello world
Hello
world
Hello world

[wkentaro]

This also supports:

>>> max_width('Hello world', 6)
Hello
world

[wkentaro]

ping

[kennethreitz]

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