Timeout in seconds, set timeout at GoogleSearch instantiation, add ssl_verify parameter

[ashishkulkarnii]

This PR has three commits:

1. Timeout in the requests library is in seconds (not milliseconds). Changed default timeout to 60 seconds.
2. Fixing issue 40 by allowing timeout to be set at GoogleSearch object instantiation.
3. Control over SSL verification parameter of the requests library at search object instantiation is a pretty useful feature, as on some networks, using requests.get(..., verify=True) throws SSLHandshakeError. A problem that I, and others, face. Fixed it by adding ssl_verify parameter during object instantiation.