reduce Narrative Number
function to add narratives through admin page
Merge branch 'dev' of https://github.com/StickMen/KungFuRhino.git
add getAudio function
add getPicture and getTotalDuration methods
test cases
add assert to tests
Merge branch 'dev' of https://github.com/StickMen/KungFuRhino.git
Merge branch 'frontend'