HSL by default with MUMPS fallback. Ipopt 3.13.0

[Libbum]

Closes #35 #36 and possibly #34 once documentation is done.

• Implement capacity
• Document
• Coverage
• Discuss issue closing or additional information in each.

[codecov]

Codecov Report

Merging #37 into master will decrease coverage by 1.16%.
The diff coverage is 72.5%.

@@            Coverage Diff             @@
##           master      #37      +/-   ##
==========================================
- Coverage     100%   98.83%   -1.17%     
==========================================
  Files          15       15              
  Lines         908      942      +34     
==========================================
+ Hits          908      931      +23     
- Misses          0       11      +11

Impacted Files	Coverage Δ
src/2013RVanilla.jl	100% <100%> (ø)	⬆️
src/Abstractions.jl	100% <100%> (ø)	⬆️
src/2013RRockyRoad.jl	100% <100%> (ø)	⬆️
src/DICE.jl	69.56% <63.15%> (-30.44%)	⬇️
src/2016R2.jl	98.75% <66.66%> (-1.25%)	⬇️
src/2016R.jl	98.73% <71.42%> (-1.27%)	⬇️

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[Libbum]

Hmm. Seems that if you test for ma27 this system works if libcoinhsl doesn't exist on a machine but ma97 essentially coredumps. Damnit.

[Libbum]

Oh, come on. Now the ma27 check is failing?

[Libbum]

OK, now it's doc etc time.

[Libbum]

Coverage drop I'm fine with. We're not going to get Travis to check HSL.