Angular 6 support

[Koslun]

Experimental Angular 6 support. Upgraded most modules and configurations that seemed relevant, mainly using steps outlined here: https://update.angular.io/. Should work for regular usage but not ready for merge to keep what I think is the development environment intact.

Tests seem to pass and can run the regular client development environment where Intercom does get launched and seem to work.

Building for the server however fails, also meaning that npm test ultimately fails due to ending with building and running a server client. Here is the error:

ERROR in ./src/server.ts
Module build failed: TypeError: Cannot read property 'ts' of undefined
    at getLoaderOptions (C:\Users\Koslun\repos\ng-intercom\node_modules\ts-loader\dist\index.js:70:44)
    at Object.loader (C:\Users\Koslun\repos\ng-intercom\node_modules\ts-loader\dist\index.js:23:19)

ERROR in ./src/server.test.ts
Module build failed: TypeError: Cannot read property 'ts' of undefined
    at getLoaderOptions (C:\Users\Koslun\repos\ng-intercom\node_modules\ts-loader\dist\index.js:70:44)
    at Object.loader (C:\Users\Koslun\repos\ng-intercom\node_modules\ts-loader\dist\index.js:23:19)

Agreed to add webpack-cli automatically the first time another seemingly related issue occurred.

Quite unfamiliar with the used SSR configuration, NGRX, ng-engine and trails config used in the library. And as it at least seems to have reached the goal of implementing Angular 6 for downstream consumers I'm hoping to leave the rest of the work for someone else. Where I hope this will either help someone else with a PR of the very same purpose or allow someone to simply iterate in this PR.

Closes #47

[Koslun]

Have a working example app using this PR here: https://github.com/Koslun/ng-example-app/tree/feat/ng6-intercom

Add this to your package.json to use this PR in your project:

"ng-intercom": "koslun/ng-intercom#641d32430d91c259e76f9f8ebef255675a3a63ef",

or

"ng-intercom": "koslun/ng-intercom#rxjs6-dist",

It points to the built distribution of this PR rather than the source code, so that it matches up with what is otherwise provided to npm. Here is that branch: https://github.com/Koslun/ng-intercom/tree/rxjs6-dist.

[scott-wyatt]

@Koslun excellent work! I'll update the last part of this SSR stuff, since that is CS Technologies specific and get this merged in as soon as possible.

[Koslun]

@scott-wyatt awesome! Thanks for continued support and an awesome library!