v 1.8.0.
Simpler code for push; now arrays could be joined through new method concat().
Fixed tests and examples with concat.
Minor fixes in comments and Readme.
On branch master
modified:   Readme.md
modified:   lib/train.js
modified:   package.json
modified:   test/forEach-test.js
modified:   test/iterate-test.js
modified:   test/iterate-with-eviction-test.js
modified:   test/next-test.js
modified:   test/train-test.js