Update: Upgrade NPM packages, babel-related, axios, etc.

[leeallen337]

Why?

Issue #64

Update/upgrade packages

What Changed?

• Removed json-loader
  • Per their documentation, for webpack v2+, importing json files works by default. See here
• Removed lolex
  • It was not being used in the boilerplate
• Removed resolve-url-loader
  • It was not being used in the boilerplate
• Updated/upgraded the below packages
  • eslint-config-smashing-boxes
  • babel-preset-stage-2
  • babel-preset-react
  • babel-preset-es2015
  • babel-loader
    • This needed a major upgrade version (e.g. from v6 to v7) because webpack v3+ needs babel-loader v7+. See here
  • babel-core
  • axios
  • es6-promise
    • Added this import into index.jsx since we always end up doing that for every project anyways

Once Merged

I will update the issue referenced in the Why section

More updates to come. Take a look at the Issue referenced in Why

[mweslander]

Once the other checks pass, this looks good.