Merge pull request #18 from def/master

disk usage in bytes
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
Merge pull request #20 from elementai/proc-smaps-skip-vmflags

skip VmFlags field when reading /proc/<pid>/smaps
Merge pull request #21 from elementai/swap-from-proc-pid-status

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