Traveling cortex packages through dependencies tree.
$ npm install cortex-deps-traveller --save
var traveller = built_rootmaxDepth: 3;traveller;// Advanced Usage, visit will travel the dep tree with BFS (which is better for performance)traveller;var Traveller = Traveller;
Generate dependencies tree from pkg
Visit the dependencies tree of pkg with a visitor
Return a sorted array from the tree
Read package information object from name and range, which utilized the internal cache in traveller
Return a version resolved from range for package
Return an array of available versions.