Apply Standard Js Hapiness norm and module tracking

[fdaugan]

Apply Standard Js Hapiness norme
@see http://standardjs.com/rules.html

To be able to unload the CSS from requireJS, the related module must be stored in the created 'link'.
Use the standard requirejs "'data-requiremodule'" attribute.

[alundiak]

@fabdouglas First of al thank you for this PR. I've recently joined as maintainer of this module, so I will be responsible in future for PRs, issues discussions, etc.

Nevertheless,

1. I am more than agree with you to follow standards. But even it says to use 2 spaces, in your PR it looks like 1 tab or 4 spaces:

I think we may do this, but in a bit different manner. First have a look to my PR: #222 - I added config file, to at least remain existed code indentation/spacing. Later on, we need to create dedicated PR for ALL files in codebase. And I will do it, and for sure will check code standards u mentioned.

2. Your code is mixed in this PR, and it's complex to review ad distinguish.

curStyle = document.createElement('style');
curStyle.setAttribute('data-requiremodule', module);

This lines are definitely not related to spacing/indentation. I don't know original nature of bug/behavior u mention in 2nd part of this PR description, but if u provide code examples, how u unload css module, it would help me to get into that faster.

3. And finally, this PR has conflict with css.js so far, so I can't merge, u have to sync with latest. Also, u have lot of commits, please squash into one.

Considering all above, it's very likely, that I will close this PR, but I will recreate new one later, with your suggestion. If during the week, will be no reply from @fabdouglas I will do this for sure.

cc/ @pavlo.savushchyk