add `popToRoot()` method in navigation API. Fixes #32
add `popToRoot()` method in navigation API. Fixes #32

kuruvilla6970/Zoot,TheHolyGrail/Zoot,kuruvilla6970/Zoot,TheHolyGrail/Zoot,kuruvilla6970/Zoot,Electrode-iOS/ELHybridWeb,Electrode-iOS/ELHybridWeb