=GURL Shortner=

* A tiny implementation of Google URL Shortner. It can shorten a URL and expand a shortened URL.

example:
```
>>> import gurlshortner
>>> gurlshortner.shorten('http://google.com')
{u'kind': u'urlshortener#url', u'id': u'http://goo.gl/mR2d', u'longUrl': u'http://google.com/'}
>>> gurlshortner.longify('http://goo.gl/mR2d')
{u'status': u'OK', u'kind': u'urlshortener#url', u'id': u'http://goo.gl/mR2d', u'longUrl': u'http://google.com/'}
```