Add SAT collision detection - #58

This is an attempt to use autoclass for axis-aligned line. This should be
nearly parity and, to help compare, includes both the auto generated
documentation and the old style documentation.

This also fixes some non-command wording in axis-aligned line

* docs/Geometry.rst - Fix incorrect reST and minor wording improvements.
Also add autoclass for AxisAlignedLine.

* pygorithm/geometry/axisall.py - Add function skeletons and (hopefully)
something resembling parity to documentation in Geometry.rst

This fixes the first wave of sphinx errors

The auto-class documentation is as good or better! Removing old style
documentation for Axis-Aligned Line

This moves the Vector2 documentation to the source code and uses
autoclass to generate it. There are minor language and formatting changes.

Fix more warnings from sphinx and change the output order to bysource

* docs/Geometry.rst - Remove backticks where not allowed
* docs/conf.py - Change output order to bysource from default

* docs/Geometry.rst - Use autoclass for Line2
* pygorithm/geometry/axisall.py - fix incorrect tuple syntax, add missing
vartypes on ivars
* pygorithm/geometry/line2.py - skeleton code
* pygorithm/geometry/vector2.py - add missing vartypes on ivars, add
magnitude_squared.

* pygorithm/geometry/line2.py - true -> True

Attempt fix failing references and try a different method of inline
code highlighting in hopes it doesn't just use red text.

* pygorithm/geometry/line2.py

As far as I can tell theres no way to easily get pretty inline code
highlighting, so use the recommended double leading/trailing backticks.

Also add missing function calculate_y_intercept

Creates skeleton for polygon2

* docs/Geometry.rst - Use autoclass instead of duplicated documentation
* pygorithm/geometry/line2.py - Add spaces around default param values
* pygorithm/geometry/polygon2.py - Add skeleton and docstrings

Pull from upstream

Add missing functions for the geometry example

* docs/Geometry.rst - use from_regular rather than weird constructor
* pygorithm/geometry/polygon2.py - Add form-regular and alternate tuple
version for init

* docs/Geometry.rst - fix incorrect quick start comment
* tests/test_geometry.py - add class TestVector2

* pygorithm/geometry/line2.py - minor documentation changes, add new method
are_parallel(line1, line)

* tests/test_geometry.py - add Line2 tests

* pygorithm/geometry/axisall.py - Minor documentation tweaks
* tests/test_geometry.py - add tests for axis aligned line

First chunk of polygon tests

* pygorithm/geometry/polygon2.py - normals cannot be a set
(vector2 is not hashable). Improve documentation and add additional options
for polygon2 from_regular. Add from_rotated and project_onto_axis

* tests/test_geometry.py - add test polygon constructor, from_regular,
from_rotated, area, and project_onto_axis. Add skeleton functions for
remainder

Merge from upstream

* pygorithm/geometry/polygon2.py :py:attribute: -> :py:attr:

* pygorithm/geometry/polygon2.py - another attribute->attr and missing tick
marks

Add tests for the various times polygons should raise an exception.

* pygorithm/geometry/polygon2.py - minor documentation changes
* tests/test_geometry.py - more polygon constructor tests

* pygorithm/geometry/polygon2.py - minor documentation changes
* tests/test_geometry.py - finish polygon2.Polygon2 tests

* docs/Geometry.rst - fix outdated quick start guide
* pygorithm/geometry/vector2.py - implement
* test/test_geometry.py - fix incorrect tests

Currently I'm running py 3.4.4 which doesn't have math.isclose. I'm not
sure the best place to put a similar method, right now I've replicated
it to the two locations that need it. Polygon will also need it. I'll try
to update python before pushing this upstream

* pygorithm/geometry/axisall.py - Implement everything, change intersects
return values and find_intersection return values (and update docs)

* pygorithm/geometry/line2.py - Implement everything. find_intersection
could be broken up but the subfunctions would need a lot of parameters
or it would repeat a lot of math

* tests/test_geometry.py - fix incorrect tests, use random.uniform instead
of random.randrange

* pygorithm/geometry/polygon2.py - Improve documentation, finish implement-
ing
* pygorithm/geometry/vector2.py - Add cross product
* tests/test_geometry.py - add cross product test, fix incorrect tests

Remove the _approx functions that I was using to delay updating

* pygorithm/geometry/axisall.py - remove _approx
* pygorithm/geometry/line2.py - remove _approx
* pygorithm/geometry/polygon2.py - remove _approx

Needed the commit on github to realize that it has been changed to
an alphabetical sort. Moved Geometry to its alphabetical location

* pygorithm/geometry/axisall.py - add __str__ and __repr__
* pygorithm/geometry/polygon2.py - document _create_links

* pygorithm/geometry/axisall.py - fix missing self.
* tests/test_geometry.py - add tests for axisall repr and str