feat(babel): support babel 6.x.x

[gregberge]

• upgrade modules
• upgrade .babelrc
• fix tests
• fix import / export
• fix build script

[salper]

👍

[iamstarkov]

LTS supported versions are 0.10, 0.12, v4 plus latest one v5

[nkbt]

Yeah, I would not drop 0.10 for now

[nathancahill]

👍

Closing the other PR in favor of this one.

[gregberge]

You can use this git branch (https://github.com/neoziro/isparta/tree/babel-6-support-with-lib) as npm package if you want to use isparta with babel 6.

@iamstarkov I changed it because I think it's important to test the latest stable, I think you or @douglasduteil can modify the .travis.yml after merging this PR.

[scriptjs]

Please merge this

[ksafranski]

bump

[nkbt]

@neoziro just a little correction:

npm install neoziro/isparta#babel-6-support-with-lib

That worked pretty well for me.

[douglasduteil]

Alright let's go

[nkbt]

woohoo \o/