Generated a linear layout of images representing the first speaker of all the respeakings of a recording in ListenActivity
When the respeaking images are clicked, the respective respeakings are presented in a new ListenActivity (this will be changed to be the same activity in future)
When ListenActivity is opened for a respeaking, it also displays other respeakings of the same original
border highlight for the image of the respeaking that is currently selected. closes #55