Added next function to iterate without eviction like in a circular queue.
On branch noeviction
Changes to be committed:
modified:   lib/train.js
Bump to version 1.3.0.
Added a method to (circular) get an element from the queue with an iterator, and without element eviciton from queue.
On branch next
Changes to be committed:
modified:   Readme.md
modified:   lib/train.js
modified:   package.json
Merge branch 'next'