Add Neighborhood Algorithm

[keurfonluu]

• Added: Neighbordhood Algorithm optimizer (Sambridge, 1999).

Reminders:

• [x] Run invoke format to make sure the code follows the style guide,
• [x] Add tests for new features or tests that would have caught the bug that you're fixing,
• [x] Write detailed docstrings for all functions, classes and/or methods,
• [x] If adding new functionality, unit test it and add it to the documentation.

[codecov-commenter]

Codecov Report

Merging #11 (682a601) into master (2ff5b76) will increase coverage by 0.17%. The diff coverage is 91.95%.

@@            Coverage Diff             @@
##           master      #11      +/-   ##
==========================================
+ Coverage   89.89%   90.06%   +0.17%     
==========================================
  Files          29       31       +2     
  Lines         950     1037      +87     
==========================================
+ Hits          854      934      +80     
- Misses         96      103       +7     

Impacted Files	Coverage Δ
stochopy/optimize/_helpers.py	100.00% <ø> (ø)
stochopy/optimize/na/_na.py	91.66% <91.66%> (ø)
stochopy/optimize/__init__.py	100.00% <100.00%> (ø)
stochopy/optimize/na/__init__.py	100.00% <100.00%> (ø)

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