allow newer version of requests

It appears that the requests library had some python3 compatibility issues that
were fixed between version 1.1.0 and the current version.

This fixes the following error when I actually try to make a request from the API using python3:

```
$ evelink eve.EVE.character_id_from_name "Stewart Cash"
APIResult(result=1759081950, timestamp=1413306683, expires=1415985083)
[stesla@WUD-STESLA03:~/Projects/evelink (master=)]$ rm ~/.evelink_cache 
[stesla@WUD-STESLA03:~/Projects/evelink (master=)]$ evelink eve.EVE.character_id_from_name "Stewart Cash"
Traceback (most recent call last):
  File "/home/stesla/Projects/evelink/bin/evelink", line 108, in call_evelink_api
    result = method_obj(*args, **kwargs)
  File "/home/stesla/Projects/evelink/evelink/eve.py", line 139, in character_id_from_name
    api_result = self.character_ids_from_names([name])
  File "/home/stesla/Projects/evelink/evelink/api.py", line 503, in wrapper
    kw['api_result'] = client.api.get(self.path, params=params)
  File "/home/stesla/Projects/evelink/evelink/api.py", line 258, in get
    response, robj = self.send_request(full_path, params)
  File "/home/stesla/Projects/evelink/evelink/api.py", line 308, in send_request
    return self.requests_request(full_path, params)
  File "/home/stesla/Projects/evelink/evelink/api.py", line 356, in requests_request
    r = session.post(full_path, data=params)
  File "/home/stesla/local/python-3.4.1/lib/python3.4/site-packages/requests/sessions.py", line 340, in post
    return self.request('POST', url, data=data, **kwargs)
  File "/home/stesla/local/python-3.4.1/lib/python3.4/site-packages/requests/sessions.py", line 279, in request
    resp = self.send(prep, stream=stream, timeout=timeout, verify=verify, cert=cert, proxies=proxies)
  File "/home/stesla/local/python-3.4.1/lib/python3.4/site-packages/requests/sessions.py", line 374, in send
    r = adapter.send(request, **kwargs)
  File "/home/stesla/local/python-3.4.1/lib/python3.4/site-packages/requests/adapters.py", line 174, in send
    timeout=timeout
  File "/home/stesla/local/python-3.4.1/lib/python3.4/site-packages/requests/packages/urllib3/connectionpool.py", line 417, in urlopen
    conn = self._get_conn(timeout=pool_timeout)
  File "/home/stesla/local/python-3.4.1/lib/python3.4/site-packages/requests/packages/urllib3/connectionpool.py", line 232, in _get_conn
    return conn or self._new_conn()
  File "/home/stesla/local/python-3.4.1/lib/python3.4/site-packages/requests/packages/urllib3/connectionpool.py", line 547, in _new_conn
    strict=self.strict)
TypeError: __init__() got an unexpected keyword argument 'strict'
```

Pleasantly, this seems to wrap up the fixes to get the `evelink` script working under python3. I've been able to poke at several API end points with it successfully now.