0.3.x from CCampJr Fork to USNISTGOV

[CCampJr]

• [x] Create 0.4.X Branch
• [x] Remove Rank-related examples and classes to 0.4.X branch
• [x] Add single-mode example to documentaion
• [x] Add semi-learned docs and/or example
• [x] Update Changelog

[codecov-io]

Codecov Report

Merging #15 into 0.3.X will increase coverage by 0.86%. The diff coverage is 100%.

@@            Coverage Diff             @@
##            0.3.X      #15      +/-   ##
==========================================
+ Coverage   97.58%   98.45%   +0.86%     
==========================================
  Files          13       11       -2     
  Lines        1408     1358      -50     
==========================================
- Hits         1374     1337      -37     
+ Misses         34       21      -13

Impacted Files	Coverage Δ
pymcr/constraints.py	98.15% <ø> (ø)	:arrow_up:
pymcr/tests/test_mcr.py	100% <100%> (ø)	:arrow_up:

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