OpenWrt to_dict method

Return a dictionary for all the properties of the OpenWRT class
OpenWRT uptime_tuple

Return a tuple representing the days, hours and minutes of uptime
Merge pull request #10 from loacker/feature/owrt-to_dict

OpenWrt to_dict method
Merge pull request #11 from loacker/feature/owrt-uptime_tuple

OpenWRT uptime_tuple