Revert Temporary Workaround from Bug 926587

Revert "Bug 926587 - [B2G][Clock][Stopwatch] Choppy transition animation going to Stopwatch from Timer or Alarm - r=jugglinmike"

This reverts commit af77086d88d66ba75dc040e4cd2fa6990be2b0bf.
Bug 921317 – [Gaia] Transform Animation in the clock app is wrong - r=jugglinmike

- Allow hashchange to initiate navigation instead of emitting 'selected' event from tabs
- Remove emitter from tabs since it doesn't need to emit anything anymore