ENH: added estsepc
ENH: added 3dvec example from lin_alg lecture
ENH: finished lqramsey examples
ENH: added discrete lqramsey example
ENH: refactored lqramsey to be more Julian
worked on arma functions
Worked on arma code
finished quad plot
Finished first pass of arma.jl
Edited docstring
Merge branch 'arma' of https://github.com/spencerlyon2/QuantEcon.jl into arma