Parsting & storing data to backend storage.

This patch set enables the user to parse data from whoscored.com and store the
player & match stats to the backend via a REST interface.

Sample usage:
$ ./get_player_stats.py \
    -u http://www.whoscored.com/Matches/614990/LiveStatistics/England-Premier-League-2012-2013-Chelsea-Manchester-United \
    --api_key <api_key> \
    --server_uri http://localhost:3000