Expose item & replace as static properties.
Expose item & replace as static properties.

Makes it possible to configure these properties globally.
Simplifies tests. We can test static properties in isolation.

eggpi/awesomplete,bchcheng/awesomplete,vlazar/awesomplete,eggpi/awesomplete,bchcheng/awesomplete,bsvobodny/awesomplete,LeaVerou/awesomplete,vlazar/awesomplete,LeaVerou/awesomplete,bsvobodny/awesomplete