remove unused ng2 bootstrap library
"@angular/platform-browser": "^4.0.0",
"@angular/platform-browser-dynamic": "^4.0.0",
"@angular/router": "^4.0.0",
- "@ng-bootstrap/ng-bootstrap": "^1.0.0-alpha.23",
"bootstrap": "^4.0.0-alpha.6",
"core-js": "^2.4.1",
"rxjs": "^5.1.0",
