echelon 0.4.0

• Added echenor() for normal model support.

echelon 0.3.1

• Optimized part of the source code.

echelon 0.3.0

• Overall improvements to the source code algorithms, including the addition of C++ code.

echelon 0.2.0

• Minor bugs fixed.

echelon 0.1.0

• This is the initial release of echelon on CRAN.