Add documentation for the new temporal window

docs/source/temporalwindow.rst

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+Temporal Window
+=================
+
+.
+
+.. image:: ./images/TemporalWindow.png
+
+Using the Temporal Window
+=========================
+
+This window gives a dual graphical representation of CAN IDs over time. For each frame in the capture a circle is placed
+on the graph at a point given by the time when the frame came in on the X axis and the frame ID on the Y axis. That is, a frame with ID 0x300
+that comes in at 23.543 seconds would be plotted at the point 23.543, 0x300. The graph background is color coded for "density." That brings up
+the question "What do you mean by density?" The answer is somewhat nebulous but essentially the color coded density maps where there is a lot of
+traffic within a small space on the graph. This could be because many frames with the same ID came in rapid fire or it could be because many 
+frames with similar IDs came in very close to each other - or both.
+
+The general point of this window is to show how active the bus is at any given point in time and which IDs are most active (they'll create
+bright streaks in the background color). There isn't a lot that can be done to modify the functionality of this window. All that can be done is 
+zooming and panning the view. If you get the view too messed up the R key will reset the view back to standard. As with the Graphing Window, it is 
+possible to select just the X or Y axis and zoom/pan that axis without affecting the other one. To do so, click on the axis marks of the axis you'd like
+to independently control. To control both again click in the graph itself.