Fix for audio bug

- Registering for play, pause, and stop commands from the viewer
- Refactoring order of operations based on new play, pause, and stop functions
- Removing the iframe element and recreating it based on play,pause, and stop
Optimization and fixes

- Applying $ in front of every cached element name that is a jquery object to make it clear that it is a jquery object
- Ensuring the fieldName applied to a validation alert is using the localized value and not a hard coded value
Remove lang attribute
Revise fix for audio bug

- Added iframe markup back to HTML
- Instead of removing the iframe element, clearing its content via src="about:blank"
- Removed _addFrame function
- Changed _removeFrame function to _unloadFrame
Merge pull request #12 from Rise-Vision/bug/audio

Fix for audio bug