v4.1.0.
Fixed serious bug with constructor option 'head', it causes all instances
to have the same qhead Array property, now is null for default.
Fixed all tests.
Added badges..
some fixes..
On branch master
modified:   .gitignore
new file:   .jshintrc
modified:   .npmignore
modified:   .travis.yml
modified:   Readme.md
modified:   lib/train.js
modified:   package.json
modified:   test/forEach-test.js
modified:   test/indexOf-test.js
modified:   test/iterate-empty-test.js
modified:   test/iterate-test.js
modified:   test/iterate-with-eviction-test.js
modified:   test/melt-test.js
modified:   test/next-test.js
modified:   test/pop-test.js
modified:   test/push-test.js
modified:   test/rollBack-limit-pop-test.js
modified:   test/rollBack-limit-shift-test.js
modified:   test/rollBack-mixed-test.js
modified:   test/rollBack-pop-test.js
modified:   test/rollBack-shift-test.js
new file:   test/run.js
modified:   test/run.sh
modified:   test/slice-test.js
modified:   test/train-test.js
deleted:    test/xconcat-test.js
new file:   test/xconcat-test_.js
modified:   test/xpush-test.js