Added a SpeechBubble prefab and Manager. The way this works is that an Notification is fired with a position, the text, and the duration of bubble. The bubble is then instantiated and added to a list of currently active bubbles. During the update function, each bubble is checked to see if they have expired. If so, they are removed. This currently does not set text on the bubble, but the bubble does show up.
Implemented a SpeechManager in which a Speech Bubble can be displayed on the screen for a given durration before being removed.
About to rebase
Merge branch 'speechbubbles'