Warnings are triggered when:
* Changing the URL Segment
* Unpublishing
* Unpublishing & Archiving
* Moving the homepage to another parent in the tree view
Also add `SiteTree->isHomePage()`
- Relaxed NodeJS dependency to 4.x
- Switch to NPM "dependencies" (rather than dev)
Provides consistency with framework, where these had previously
been broken out between "dependencies" and "devDependencies", which in turn caused issues with "npm shrinkwrap"
- Add npm-shrinkwrap.json: Consistent with framework approach
Using uber's wrapper library since it prevents npm shrinkwrap from failing on file generation,
as well as actually suceeding with an "npm install" once the file is present.
- Don't add comments to dist files via babelify
We've had some issues with different dependencies causing different results based on the environment,
which in turn causes unnecessary diffs - making our work harder to review.
Comments can be read through the ES6 source files, and through source maps when
generated through `npm run build --development`
- Make JS build tooling and naming consistent with framework
Uses https://github.com/uber/npm-shrinkwrap instead of the built-in "npm shrinkwrap" since it works more reliably.
Specifically, "npm install" doesn't fail depending on node_modules/ being installed in the local cache or not.
It also makes npm-shrinkwrap.json easier to diff by more consistently ordering its output between runs.
If you need any convincing that this is a problem, look at the over 400 issues related to "shrinkwrap"
in https://github.com/npm/npm/search?q=shrinkwrap&type=Issues&utf8=%E2%9C%93
