trivial stuff for make clean-all
use stan tag v2.1.0
Merge branch 'release/v.2.1.0' into develop
add a test for optimizing
fix wrong function name used in optimizing
add an example for optimizing
fix the issue in optimizing
remove make check from travis to shorten time
fix init.cpp not working on R version less than 2.16.0
fix the name issue for optimizing with hessian
Merge branch 'develop'