fixup! Add some tests and Travis integration

README.md

@@ -10,7 +10,7 @@ The format used here is as follows:
   them.
 - Horizontal walls are represented with three `---`.
 - Vertical walls are represented with a single `|`.
-- Goal cells might have a `G` in the certer of the cell.
+- The goal cell in half-size mazes has a `G` in the certer of the cell.
 - Starting cells might have an `S` in the certer of the cell.
 
 Here is an example of a 4x4 maze:
@@ -29,7 +29,7 @@ o---o---o---o---o
 
 **classic** mazes are all 16x16. Some of these have smaller active areaswhere the event in which they were used only had a smaller maze available. That may have been 7x8, 8x8, 11x11 or some other size. All these mazes have a legal goal cell in cell 7,7.
 
-**halfsize** mazes are all 32x32. The goal is not fixed in the same way as it might be in the classic contest. Goal cells are marked with an "G" in the centre of the cell. The goal may be a single cell or a rectangular block of cells.
+**halfsize** mazes are all 32x32. The goal is not fixed in the same way as it might be in the classic contest. The goal for halfsize mazes is a single cell, marked with a "G" in the center of the cell, which may be part of a larger area.
 
 **training** mazes are all 16x16 but may not have legal goal areas as the useable area might be only 5x5, 8x8, 10x5 or some other size representing small mazes used for testing a mouse where there is not room for a full sized maze. The filename should indicate the active area.