Habanero mailto + other fixes

[bryanwweber]

• [x] Added entry into CHANGELOG.md

Changes proposed in this pull request:

• Add mailto argument to Crossref API constructor from Habanero
• Use common instance of Crossref API in converters and validation (speeds up the tests some more)
• Remove unused utils.py code and move creation of unit registry to validation.py
• Add conversion of d/dt max extrapolated ignition type to/from ReSpecTh

@pr-omethe-us/chemked

[codecov[bot]]

Codecov Report

Merging #97 into master will not change coverage. The diff coverage is 100%.

@@          Coverage Diff          @@
##           master    #97   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           5      4    -1     
  Lines         883    879    -4     
  Branches      210    212    +2     
=====================================
- Hits          883    879    -4

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

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[kyleniemeyer]

Is the loss of coverage here also made up in another PR?

[bryanwweber]

Yes, the @codecov comment should be updated now with 100% coverage. Actually, the reason was because I originally didn't include those changes to bring it back to 100% in this changeset (because they were already in #96), but now its been rebased on the new master after merging #96 so all should be well.