[WIP] Add time histories

[bryanwweber]

• [ ] Fixes #91
• [ ] Tests added
• [ ] Added entry into CHANGELOG.md
• [ ] Documentation updated

Changes proposed in this pull request:

• This PR adds a time-histories field to encapsulate all of the time-varying properties of an experiment, including pressure, temperature, volume, absorption, emission, and piston position

@pr-omethe-us/chemked

[kyleniemeyer]

Was this expected to fail (if still in progress), or no?

[bryanwweber]

It's a flake8 failure, so I'd say, yes because WIP, but not expected 😄

[codecov[bot]]

Codecov Report

Merging #104 into master will not change coverage. The diff coverage is 100%.

@@          Coverage Diff          @@
##           master   #104   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           3      3           
  Lines         878    951   +73     
  Branches      212    228   +16     
=====================================
+ Hits          878    951   +73

Impacted Files	Coverage Δ
pyked/converters.py	100% <100%> (ø)	:arrow_up:
pyked/validation.py	100% <100%> (ø)	:arrow_up:
pyked/chemked.py	100% <100%> (ø)	:arrow_up:

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[bryanwweber]

Once the tests pass, this should be good to merge :+1: