Merge pull request shirou#452 from leafnunes/master

prevent hang on pkg import if wmi.Query hangs

add HOST_VAR to README

Merge pull request shirou#423 from derekwbrown/db/windows_swap_memory

Add implementation of SwapMemory() for windows

Merge pull request shirou#346 from phemmer/rlimit-current

add current values to rlimit retrieval

[host]: add not implemented methods.

Merge pull request shirou#382 from acd/master

Only read /proc/stat once when cpu.Times(true) is called on Linux

Merge pull request shirou#379 from magiconair/fix-host-boottime-race

Fix data race in host.BootTime

Merge pull request shirou#358 from ablagoev/optimize-net-connections

Fromat socketType properly in tcp duplication check key

[host]darwin: PlatformInformation has been 5 values other is 4.

Merge pull request shirou#320 from tychoish/close-files-more-often

close open files