Trim down documentation, add new save window id feature description
Trim down documentation, add new save window id feature description

Nolanus/ngx-multi-window,Nolanus/ngx-multi-window,Nolanus/ng2-multi-window,Nolanus/ng2-multi-window,Nolanus/ngx-multi-window,Nolanus/ngx-multi-window,Nolanus/ng2-multi-window