ib 0.2.0

Enhance documentation with better explanations and fix minor typos.
Fix typo in summary for negative binomial family.
Fix an issue in the IB algorithm for updating parameters with positivity constraint.
Enhance ibControl by allowing control over constraint.
Enhance simulation for glm by allowing user-defined function.
Enhance simulation for negative binomial family.
New feature by exporting the simulation method.
Enhance by adding the betareg family.
Enhance the stopping criteria for the IB algorithm.

ib 0.1.0

First version for submission to CRAN. The package is made available on GitHub (github.com/SMAC-Group/ib/)