StanMoMo 1.1.1

The following updates have been made to ensure compatibility with the latest rstan version:

New array syntax
offset is a reserved keyword, changed to input_offset
fabs replaced by abs

StanMoMo 1.1.0

Remove the function load_HMD_data which was causing an error due to the update of the HMD website.

StanMoMo 1.0.0

First stable version of StanMoMo released to CRAN.