Use matplotlib for images

Replace all the graph files and generated images with matplotlib files and
generated images. This is from @IanDoarns suggestion on
OmkarPathak#69.

* imgs/test_geometry/test_extrapolated_intersection/(many) - replace with
	matplotlib files

* tests/test_geometry.py - update documentation to remove references to
	Graph files (in favor of matplotlib)

Author: Tjstretchalot

imgs/test_geometry/test_extrapolated_intersection/__init__.py

@@ -0,0 +1,31 @@
+from utils import create_newfig, create_moving_point, create_still_segment, run_or_export
+    
+def setup_fig01():
+    fig, ax, renderer = create_newfig('aa01')
+
+    create_moving_point(fig, ax, renderer, 1, 1, 6, 1)
+    create_still_segment(fig, ax, renderer, (2, 4), (6, 2))
+    return fig, ax, 'aa01_test_point_line_no_intr'
+
+def setup_fig02():
+    fig, ax, renderer = create_newfig('aa02')
+    
+    create_moving_point(fig, ax, renderer, 1, 1, 1, 4)
+    create_still_segment(fig, ax, renderer, (2, 4), (6, 2), 'topright')
+    return fig, ax, 'aa02_test_point_line_no_intr'
+
+def setup_fig03():
+    fig, ax, renderer = create_newfig('aa03')
+    
+    create_moving_point(fig, ax, renderer, 4, 1, 1, 4)
+    create_still_segment(fig, ax, renderer, (2, 4), (6, 4), 'topright')
+    return fig, ax, 'aa03_test_point_line_no_intr'
+    
+def setup_fig04():
+    fig, ax, renderer = create_newfig('aa04')
+    
+    create_moving_point(fig, ax, renderer, 2, 1, 6, 4)
+    create_still_segment(fig, ax, renderer, (1, 2), (5, 4), 'topleft')
+    return fig, ax, 'aa04_test_point_line_no_intr'
+
+run_or_export(setup_fig01, setup_fig02, setup_fig03, setup_fig04)