'Retrieves a dictionary of all of the emojis that GitHub supports.
:returns: dictionary where the key is what would be in between the
colons and the value is the URL to the image, e.g., ::
\'+1\': \'https://github.global.ssl.fastly.net/images/...\','

def emojis(self):

    url = self._build_url(u'emojis')
    return self._json(self._get(url), 200, include_cache_info=False)
