add reference to to_json() method in README
OpenWrt uptime

Method that parse a proc file and return a integer represent the machine
uptime in seconds.
Write the relative test.
Merge pull request #9 from loacker/owrt-uptime

OpenWrt uptime
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
Merge branch 'master' of git://github.com/nemesisdesign/netengine

Conflicts:
	netengine/backends/ssh/openwrt.py