Begin documentation for geometry

This took longer than expected, but it's the first pass at the
documentation for the geometry module, which is going to be necessary to
test some of the more complicated pathfinding algorithms which operate
on entities of varying sizes rather than point particles.

docs/Geometry.rst - Document vector2, line2, axisall, polygon2
docs/index.rst - Add geometry
pygorithm/__init__.py - Add geometry
pygorithm/geometry/__init__.py - Import vector2, axisall, line2, polygon2
pygorithm/geometry/axisall.py - Empty file
pygorithm/geometry/line2.py - Empty file
pygorithm/geometry/polygon2.py - Empty file
pygorithm/geometry/vector2.py - Empty file
tests/test_geometry.py - Empty file

Author: Tjstretchalot

docs/Geometry.rst

@@ -28,6 +28,7 @@ Quick Links
    Fibonacci
    Math
    Pathfinding
+   Geometry
 
 Quick Start Guide
 -----------------

docs/index.rst

@@ -64,4 +64,5 @@
     'sorting',
     'string',
     'pathfinding',
+    'geometry'
 ]

pygorithm/__init__.py

@@ -0,0 +1,14 @@
+"""
+Collection of geometry examples
+"""
+from . import vector2
+from . import axisall
+from . import line2
+from . import polygon2
+
+__all__ = [
+    'vector2',
+    'axisall',
+    'line2',
+    'polygon2'
+]