Physical memory additional information implementation

[rohitkukreja1508]

Fixes #419

[coveralls]

Coverage increased (+0.3%) to 81.53% when pulling d5288eb on rohitkukreja1508:Physical-memory-speed-implementation into 3fe6f09 on oshi:master.

[codecov-io]

Codecov Report

Merging #1005 into master will increase coverage by 0.34%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master    #1005      +/-   ##
============================================
+ Coverage     77.43%   77.78%   +0.34%     
  Complexity        2        2              
============================================
  Files            24       25       +1     
  Lines          1210     1229      +19     
  Branches        155      155              
============================================
+ Hits            937      956      +19     
  Misses          206      206              
  Partials         67       67

Impacted Files	Coverage Δ	Complexity Δ
oshi-core/src/main/java/oshi/util/ParseUtil.java	94.88% <ø> (ø)	0 <0> (ø)	⬇️
...re/src/main/java/oshi/hardware/PhysicalMemory.java	100% <100%> (ø)	0 <0> (?)

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[dbwiddis]

This looks really good so far. I've made some extremely minor comments/preferences.

[dbwiddis]

I've done the mac and Unix implementations. Can you review/test my changes?