Fixes the abstract rendering transpose error

* Fixes on old line 256 to new line 296 repair the transpose
* Fixes on 229 and 230 make the guides more accurate
* Example classes: abstractrender.py is now correct;  census plot is now in census.py by itself 
* Change in abstract_render in 0.1.1 drove a small interface change (BinarySegment class)
* Lots of formatting changes (because I only recently heard of pep8...)
ie, still ugly but only using one print function:
```python
print("""
**************************************************************
Error loading the abstract_rendering package.
To use the ar_downsample module, you must install the
abstract rendering framework.
This can be installed with conda, pip or by
cloning from https://github.com/JosephCottam/AbstractRendering
Questions and feedback can be directed to
Joseph Cottam (jcottam@indiana.edu)
**************************************************************
""")
```