new feature - network connection status

[victorvoid]

The idea is to give 3 options:

  <ConnectionStatus when="online" do={this.handleOnline}/>
  <ConnectionStatus when="offline" do={this.handleOffline}/>
  <ConnectionStatus when='*' do={this.handleConnection}/>

[felquis]

I can rebase it too :) I'll think I can cherry-pick your commit and keep your authoring.