Seek to start button on listen page

[atruskie]

On the listen page, add a button that resets the current audio's position to zero (play from start)

• Add a correct bootstrap icon / button
• Create an appropriate empty function on the listen controller's scope
• Bind the button to the function with ng-click
• See if you can work out how the ng-audio directive works - present a solution to me

[atruskie]

@otherphil80, I see your commit (9d77ae1).

Two points -
a) tostart should be toStart
b) why is tostart in the events list (9d77ae1#diff-a15cfc90836897adc1b9bb68715cbf35R87)?

[peichins]

A and B are both fixed (fac3758)

B - yeah I realised that tostart is not a AUDIO DOM event so there was no reason for it to be in the list.

[atruskie]

Confirmed, fac3758, closes #3