Various fixes

[zertosh]

This PR reverts many of the stylistic changes made post-v0.1.0, namely going back to es5 and not linting.

The move back to es5 is for testability purposes. Depending on transpiling and node flags just to run tests - even on the latest node - makes testing more difficult than it needs to be.

I have nothing against linting, except when they're flaky, not clear, and get in the way of testing.

The rest of the changes are fixes.

@shinnn Despite this, thank you for taking the care to modernize the tests and examples. Can you take a quick look at this? The commits are atomic.

(@shinnn edited)

fix #5
fix #7
fix #10

[zertosh]

This is an alternate example.js that shows extending the stream classes and works with node 4.x w/o flags: https://gist.github.com/zertosh/b68478fbfe54d7270961

[shinnn]

My goal was not to rule this project opinionatedly, but to move forward this project. and now it's achieved by @zertosh :).

Go right ahead and thanks for keep maintaining this project.

[zertosh]

Thanks @shinnn! And you too, for stepping up when things needed to get done 👍