Added canvas-nest.min.js in a better way.

[AlynxZhou]

Just added canves-nest.min.js as a internal lib and add two configs, one is open or close, default is close, the other is about using a CDN, the way I used is just like what NexT do normal for libs such as jquery. And the major change is in vendors.swig instead of _layout.swig, which is more like what NexT use, and is better than the way than #1326 .
Tested with my own website in both internal and CDN, it worked perfectly.

[AlynxZhou]

Here is my website 请叫我喵's StackHarbor, you can visit my page via computer to see it.

[MoshiCoCo]

Hello, developer
When I use hexo, canvas-nest doesn't work. I found that when the hexo g was executed, the generated canvas-nest.min.js code ended up with more parts, which made the canvas-nest not work. what is the reason?

This is the part of the code that is more after executing hexo g
</0?-1:1,e.fillrect(i.x-0.5,i.y-0.5,1,1);for(v=0;v<w.length;v++){x=w[v];if(i!==x&&null!==x.x&&null!==x.y){b=i.x-x.x,z=i.y-x.y,y=b*b+z*z;y<x.max&&(x===f&&y></0?-1:1,i.ya*=i.y>

My English expression is not very good, with the help of Google Translate, so you may have some difficulty reading this passage and expect to get your answer.

[ivan-nginx]

NexT is rebased into organization repo.
If you want new feature, fix, or support, create new in NexT v6.x repo (desirable in English).

There is instructions on English or Chinese how to update from v5.1.x to v 6.x

You also may read this for details.