fix(typeahead): allow to work with formControl     fixes #1595
fix(typeahead): allow to work with formControl
    fixes #1595

felixkubli/ng2-bootstrap,valor-software/ng2-bootstrap,valor-software/ngx-bootstrap,valor-software/ngx-bootstrap,felixkubli/ng2-bootstrap,valor-software/ngx-bootstrap,IlyaSurmay/ngx-bootstrap-versioning,valor-software/ng2-bootstrap,valor-software/ngx-bootstrap,erodriguezh/ngx-bootstrap,Le0Michine/ng2-bootstrap,buchslava/angular2-bootstrap,Le0Michine/ng2-bootstrap,buchslava/angular2-bootstrap,felixkubli/ng2-bootstrap,IlyaSurmay/ngx-bootstrap-versioning,buchslava/angular2-bootstrap