fix errors when building with AOT

[jbhelm]

Fix errors when building with AOT on angular-cli (ng build --prod)

[silentzone]

still have AOT build erro

ERROR in Unexpected value 'NgSemanticModule in ‘node_modules/ng-semantic/ng-semantic.d.ts' imported by the module 'PagesModule in app/pages/pages.module.ts'

ERROR in ./src/main.ts
Module not found: Error: Can't resolve './$$_gendir/app/app.module.ngfactory' in '\src'
 @ ./src/main.ts 5:29-76
 @ multi ./src/main.ts