Links saver

1. in stall redis database
   
2. activate virtualenv
3. install requirements.txt
   $ pip install -r requirements.txt
4. run application
   flask run

test

manual:
please open console
$ curl --header "Content-Type: application/json" --request POST --data '{ "links": ["https://ya.ru", "https://ya.ru?q=123", "funbox.ru", "https://stackoverflow.com/questions/11828270/how-to-exit-the-vim-editor"] }' http://localhost:5000/visited_links

$ "http://localhost:5000/visited_domains?from=1385640049&to=1885840286"

for run autotests, execute
$ python -m pytest