Added item net.if.in
Added item net.if.out
Added HostOS.process_infos()

And implemented it in Linux
Added HostOS.uid()

And implemented it in Linux
Added item proc.num
Merge branch 'master' into new_items
Added HostOS.memory()
Added item vm.memory.size
Added item vfs.dev.read without values per second
Merge branch 'master' into new_items
Implemented DiskDeviceStatsCollector
Added per second stats to vfs.dev.read
Added item vfs.dev.write
Implemented CpuTimesCollector
Added item system.cpu.util
Added item system.hostname
Added item system.uname
Added item system.uptime
Added item kernel.maxproc
Added item system.cpu.load