[WIP] feat: adding experimental properties

[kjappelbaum]

Should be squashed before merging.

Implements "Parsers" for basic computed and experimental properties. @lpatiny It is still "dirty" but maybe you can give it a look if you're fine with the overall approach. If you're ok I'll add more properties + tests and clean up.

Experimental properties

• Experimental properties are automatically parsed using js-quantities if this works out, we use them to summarize using mean/median/stdev. The benzene test case has multiple entries for boiling and melting point, some of which we cannot easily parse.
• For experimental data, the details output will contain the raw strings for all references

Computed properties

Apparently, for computed properties, there is always only one float. Sometimes with the unit, sometimes without. For this reason, i decided against the returnDetails option. The output will be of the form

{value: <number> 
references: <Object>}

where references is of the same form as everywhere else.

General

I didn't yet add the methods to the CompoundData class.

[codecov[bot]]

Codecov Report

Merging #11 (08b8961) into master (15198e1) will increase coverage by 1.94%. The diff coverage is 87.06%.

@@            Coverage Diff             @@
##           master      #11      +/-   ##
==========================================
+ Coverage   83.50%   85.44%   +1.94%     
==========================================
  Files           9       11       +2     
  Lines          97      213     +116     
  Branches       17       60      +43     
==========================================
+ Hits           81      182     +101     
- Misses         14       29      +15     
  Partials        2        2              

Impacted Files	Coverage Δ
src/compoundData/getExperimentalData.js	76.92% <76.92%> (ø)
src/compoundData/getComputedData.js	100.00% <100.00%> (ø)

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