Fixed chatBox AccessibilityProperties that was seted before being initialized.
Removed uncessary binding for LoadingBar positioning.
Add test to check if variable is null
Merge pull request #234 from mconf/fix-accessibilityProperties-0.81

Fixed chatBox AccessibilityProperties that was seted before being initia...
added back in the playback buffering indicator and fixed some issues with it
Merge pull request #230 from speakserve/flex-client-updates

LoadingBar properties binding replaced by fixed values.
Merge pull request #237 from SenecaCDOT-BigBlueButton/renable-playback-buffering

added back in the playback buffering indicator and fixed some issues with it
merge upstream