cookies.morsel_to_cookie morsel['expires'] can't be strtime, and morsel['max-age'] convert to expires problem repair

eg. view yahoo.com will return:
```
Set-Cookie	B=9a3jpi98r1dd8&b=3&s=fb; expires=Sun, 07-Jun-2015 16:15:36 GMT; path=/; domain=.yahoo.com
```

expires is str time, but cookielib.Cookie.expires only int
py code:
```
    str_cookie = "B=9a3jpi98r1dd8&b=3&s=fb; expires=Sun, 07-Jun-2015 16:15:36 GMT; path=/; domain=.yahoo.com"
    C = Cookie.SimpleCookie(str_cookie)
    for morsel in C.values():
        cookie = requests.cookies.morsel_to_cookie(morsel)
        print cookie
```

1.raise TypeError:
TypeError: create_cookie() got unexpected keyword arguments: ['path_specified', 'domain_specified', 'port_specified', 'domain_initial_dot']

so we should remove these param from morsel_to_cookie(morsel):create_cookie(....)

2.where  repair 1 after, will raise:
  File "/usr/lib/python2.7/cookielib.py", line 739, in __init__
    if expires is not None: expires = int(expires)
ValueError: invalid literal for int() with base 10: 'Sun, 07-Jun-2015 16:15:36 GMT'