package refactor

[crflynn]

• remove zero args from sample methods
• update diffusions inheritance and api
• remove diffusion alias classes
• add a generalized diffusion class
• refactor base and process classes into process and utils submodule
• move validation functions into utils
• better abstract base class hierarchy for common methods
• add dirichlet process
• add random number generator control and functionality at the package and instance level
• update documentation

[codecov-io]

Codecov Report

:exclamation: No coverage uploaded for pull request base (master@bcc69ed). Click here to learn what that means. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             master       #43   +/-   ##
==========================================
  Coverage          ?   100.00%           
==========================================
  Files             ?        42           
  Lines             ?      1379           
  Branches          ?         0           
==========================================
  Hits              ?      1379           
  Misses            ?         0           
  Partials          ?         0           

Impacted Files	Coverage Δ
stochastic/__init__.py	100.00% <100.00%> (ø)
stochastic/_version.py	100.00% <100.00%> (ø)
stochastic/processes/__init__.py	100.00% <100.00%> (ø)
stochastic/processes/base.py	100.00% <100.00%> (ø)
stochastic/processes/continuous/__init__.py	100.00% <100.00%> (ø)
stochastic/processes/continuous/bessel.py	100.00% <100.00%> (ø)
stochastic/processes/continuous/brownian_bridge.py	100.00% <100.00%> (ø)
...chastic/processes/continuous/brownian_excursion.py	100.00% <100.00%> (ø)
...tochastic/processes/continuous/brownian_meander.py	100.00% <100.00%> (ø)
stochastic/processes/continuous/brownian_motion.py	100.00% <100.00%> (ø)
... and 32 more

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