thurstonianIRT 0.10.0

Bug Fixes

• Correctly handle standard errors of trait scores as returned by Mplus.
• Fix the triplets example data to work with lavaan and Mplus without
  convergence issues. (#3)

New Features

• Support family gaussian when using lavaan as the model fitting engine.

Other Changes

• Improve the documentation and presentation of the package across the board
  thanks to Russell S. Pierce, Thomas J. Faulkenberry, and Daniel S. Katz.
  (#2, #5, #7, #8, #9)