WIP: Add image handling example

[cheremukhin23]

This change is 

[justin808]

@cheremukhin23 Please be sure to check the Travis results:

-regenerator@^6.22.0Invalid configuration object. Webpack has been initialised using a configuration object that does not match the API schema.

https://travis-ci.org/shakacode/react_on_rails/jobs/213883336

[justin808]

4f7203b: Lock webpack version in generators to 2.2.1

What caused this issue?

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Reviewed 22 of 22 files at r1, 1 of 1 files at r2, 1 of 2 files at r3, 1 of 1 files at r4.
Review status: all files reviewed at latest revision, 1 unresolved discussion.

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CHANGELOG.md, line 11 at r4 (raw file):

## Fixed
- Locked Webpack version in generators to 2.2.1
- Added style-loaders to webpack config

This doesn't match other CHANGELOG comments...FYI

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Comments from Reviewable

[justin808]

@cheremukhin23 Can you try updating to 2.3.1, which is the webpack current. If that works, then let's merge. The change as it is now requires a release, so we should just move to the current version.

[cheremukhin23]

@justin808 The issue is caused by breaking change in Webpack itself.
The output.path required to be an absolute path in webpack v2, but currently it is relative '../app/assets/webpack'.
In webpack 2.2.x there was no absolute path validation, but in 2.3.x it is added.

I'll create a separate PR with webpack update and delete version change from this one.

[cheremukhin23]

I've made webpack upgrade as a separate PR. So, I deleted last commits with webpack version lock and CHANGELOG.md.
This PR is waiting for #771 now

[justin808]

LGTM!