Expand all macros.
Allow for multiple AmplModel instances.
Move prototypes to header file.
Add print_formatted function.
Print formatted arrays.
Beautify header.
Use multiple models in test.
Add Rosenbrock nl file.
Update README.
Add display methods and reorganize ampl.jl.
Simplify test using display methods.
Merge branch 'feature/multi_asl' into develop
Phase out print_array, use display.
Add example to README.
Add version file.
Merge branch 'release/v01'