Refactoring + min_price read from database

- now everything is saved in file as:
  { "config_data" : {"timestamp" : 1234, "min_price": 2.5},
    "data" : [{data about stations}, {}, {}]}
increase paz icon

Signed-off-by: Yakov Goldberg <yakov.g@samsung.com>
update initial data in assets/output

Signed-off-by: Yakov Goldberg <yakov.g@samsung.com>