When creating new project: 		ng new My_New_Project --style=sass    
								npm install node-sass --save-dev
								
On existing project: 			ng set defaults.styleExt scss		  
								npm install node-sass --save-dev   
								change .angular-cli.json -> "styles": ["styles.scss"]

On existing project:			npm install ngx-bootstrap bootstrap@next jquery tether popper.js --save

Add to style.scss:			    @import "../node_modules/bootstrap/scss/bootstrap";

Add to angular-cli.json:		In "scripts" section:
								"../node_modules/jquery/dist/jquery.js",
								"../node_modules/popper.js/dist/umd/popper.min.js",
								"../node_modules/tether/dist/js/tether.js",
								"../node_modules/bootstrap/dist/js/bootstrap.js"

In app.modules.ts: 				Add this code before the @NgModule({}) declaration:
								export function InitConfig(settings: SettingsService) { return () => settings.LoadConf();}
								
								Add in the provider array this code:
								 {provide: APP_INITIALIZER, useFactory: InitConfig , deps: [SettingsService], multi: true}
								
In settings.service.ts			Add method:
								 LoadConf() {
									return new Promise((resolve, reject) => {
										this.http.get<any>('assets/config/config.json').subscribe((conf: any) => {
										this.settings = conf;
										resolve();
									}, error => reject());
									});
								}