Connection._call timeout argument is unused

[pramttl]

The Connection._call timeout argument defaults to 5000 but seems to be unused.
https://github.com/bitly/bitly-api-python/blob/master/bitly_api/bitly_api.py#L774

[goodspark]

Looks like it should be passed to https://github.com/bitly/bitly-api-python/blob/master/bitly_api/bitly_api.py#L802
https://docs.python.org/2/library/urllib2.html#urllib2.OpenerDirector.open