Alerts the user that space is low when the remaining disk space is 15 MB.
fixed style problems and bugs from my previous commit
changed the threshold to 10 GB
- fixed a bug where the low disk space warning wouldn't show when freeseer starts recording below the threshold.  - added notifications bar to record GUI in order to display warnings and errors to the user
added mutator functions for notification bar
correcting style errors
Removed Warning message code (will be committed to it's respective branch)
Local example of notification queue
modified notification list class
used ordered dictionary for notification queue, initialized queue in FreeseerApp, added call bacl functions