Add documentation

[keurfonluu]

• Added: basic documentation built on Travis CI.

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 #6 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master       #6   +/-   ##
=======================================
  Coverage   89.80%   89.80%           
=======================================
  Files          29       29           
  Lines         942      942           
=======================================
  Hits          846      846           
  Misses         96       96           

Impacted Files	Coverage Δ
stochopy/optimize/_helpers.py	100.00% <ø> (ø)
stochopy/optimize/cmaes/_cmaes.py	90.15% <ø> (ø)
stochopy/optimize/cpso/_cpso.py	89.81% <ø> (ø)
stochopy/optimize/de/_de.py	90.42% <ø> (ø)
stochopy/optimize/pso/_pso.py	100.00% <ø> (ø)
stochopy/optimize/vdcma/_vdcma.py	87.57% <ø> (ø)
stochopy/sample/_helpers.py	100.00% <ø> (ø)
stochopy/sample/hmc/_hmc.py	87.95% <ø> (ø)
stochopy/sample/mcmc/_mcmc.py	90.74% <ø> (ø)

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