Update build tools

[thiamsantos]

Sorry if any of the changes are out of scope.

CHANGELOG

• Use rollup instead of webpack #225.
• Remove unnecessary file eslintignore.
• Move babel and eslint configurations to package.json.
• Change scripts that use environment variables because windows doesn't work well with them.
• Update deep-diff.
• Remove open-url because http-server already has an option to open the browser after starting the server.
• Remove babel-cli and others unused plugins and presets.
• Expose files using ES2015 modules through the properties pkg.module and pkg.jsnext:main.

[codecov-io]

Codecov Report

Merging #227 into master will increase coverage by 16.91%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master     #227       +/-   ##
===========================================
+ Coverage   68.38%   85.29%   +16.91%     
===========================================
  Files           5        5               
  Lines         136      136               
===========================================
+ Hits           93      116       +23     
+ Misses         43       20       -23

Impacted Files	Coverage Δ
src/diff.js	100% <ø> (+92%)	⬆️

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[imevro]

Awesome, will merge after fixes

[imevro]

Can move scripts as they appears? For example, build run rollup, so rollup must be higher than build

[imevro]

We don't need non-minified versions, so you can produce minified versions right here

[thiamsantos]

Sure. But I'm still in doubt if I should bundle two different versions, one using UMD and another CommonJS modules. Maybe just one is enough. What do you think @evgenyrodionov ?

[imevro]

I think UMD is enough

[thiamsantos]

Any thoughts @evgenyrodionov?

[imevro]

Looks good, but I need test it. On Monday, I guess.

[thiamsantos]

I hope you don't mind @evgenyrodionov. I am taking advantage of this pull request to add some tests.

[imevro]

Thank you! It looks pretty awesome.

[thiamsantos]

Thanks @evgenyrodionov!!!

[thiamsantos]

Expose files using ES2015 modules through the properties pkg.module and pkg.jsnext:main.

As I mentioned above if you use a module bundler like webpack or rollup, it will get the code from the source files. That can cause problems like #229 when you don't use the babel plugin to handle the object spread operator. So I think that we can either explain that on readme and ask for people use the plugin or just expose the bundled file as was made before and prevent these problems. What do you think @evgenyrodionov?

[imevro]

Object spread operator already fixed in 3.0.3, it's stage 3 proposal (candidate), so it was my mistake.