v2.3

[pzivich]

v2.3 Release

Regression calibration

• [x] Add built-in EE
• [x] Add docs and example
• [x] Add test coverage

E_max model

• [x] Add built-in EE
• [x] Add docs and example
• [x] Add test coverage

Log-logistic model

• [x] Future versions will replace the number_log models with a general log-logistic model. This is more flexible.
• [x] Add warning to old versions
• [x] Update examples documentation to use the new version

[pzivich]

I'm also going to make an update for how the log-logistic models work. There is going to be a new function and does all the log-logistic models. The ee_#_logistic models will be dropped in v3.0