Switched to babel ES5 build in dist folder for package distribution

[holgerd77]

Since topic also came up here:

This PR switches to babelified ES5 packaging. Tests are included in the babel build. For test run with the test script, distribution tests are used, coverage is using the original test files in the test folder.

[mohammadrafigh]

great, thanks 👍 but why dist folder is ignored?

[holgerd77]

Dist folder is only created for the build, otherwise there is the risk if inconsistent repository states.

[mohammadrafigh]

ok but this way npm won't fetch and build the dist folder when using npm install ethereumjs-wallet in another project. or maybe you want to publish dists separately?

[holgerd77]

I have just tested this for another library (ethereumjs-util) to double-check, dist folder is actually included there when library is installed with npm.

The dist folder is included with the files directive in package.json, so it is distributed with the npm package, npm is ignoring .gitignore here. Do you have any other information beyond that I didn't consider here?

[mohammadrafigh]

I also use ethereumjs-util and it's ok, in my node_modules there is a dist folder. but there is no dist folder in ethereumjs-wallet when fetching from github using npm. maybe there is a bug in npm that won't run build script for dependencies fetched from git. so if this is the case then yes this PR is ok IMO. thanks for your fast PR.

[coveralls]

Coverage remained the same at 86.62% when pulling 99b5d3d on es5-dist into 01382b1 on master.