[linux] fix /proc/net/dev parsing

Update README.rst

Corrected spelling error.

Update README.rst

Corrected some typos and grammer errors.
Tweaked a couple of small things for consistency (section title capitalization, etc.).
Corrected a misreference to an added function CPUInfo (the function returned a CPUInfoStat struct, but the actual function name is CPUInfo).

CPUTimes per cpu and CPUPercent

[linux] fill SwapMemoryStat.Sin/Sout from /proc/vmstat

Add MemoryInfoStat to Process and fill it while reading /proc/<pid>/status

skip VmFlags field when reading /proc/<pid>/smaps

add memInfo *MemoryInfoStat to Process struct, fill memInfo while reading /proc/<pid>/status, Process.MemoryInfo() returns memInfo

disk usage in bytes

Fix typo

Errorhandling