Emv1 - multithreading

[emvolz]

This version includes optional multithreading computation for rprocess and rmeasure
I would check it a little more carefully; I'm still getting to grips with the code, so I may have introduced problems, however all the tests are passing. I also added a 'speed2' test which is showing this

ie about 3-4x speed up when loading with $julia -t auto
on my computer that's about 8 cores

pfilter shows less, but I haven't parallelized dmeasure etc.
Let me know if you want me to pursue this

[codecov]

Codecov Report

Attention: Patch coverage is 63.41463% with 15 lines in your changes missing coverage. Please review.

Project coverage is 95.15%. Comparing base (77b800f) to head (55c2505).
Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##            master      #13      +/-   ##
===========================================
- Coverage   100.00%   95.15%   -4.85%     
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  Files           15       16       +1     
  Lines          398      433      +35     
===========================================
+ Hits           398      412      +14     
- Misses           0       21      +21