Transitfeed

- Schedule Viewer changes:
- More accurate display of route names
- Better support for unicode IDs
- Stop time interpolation
- FeedValidator changes:
- FeedValidator now categorizes issues as either errors or warnings
- Checks for missing start & end times on trips
- Warning if the feed has expired or will in the next month
- Better handling of UTF-8/16 and other file encoding issues
- Allows more lenient sequence numbers now that the spec allows them
- Added warning for poor route color contrast

- Schedule Viewer now displays shapes when available.
- FeedValidator now shows feed metadata at the top of its output and highlights the relevant column for problems.
- Added `--output` switch to set HTML output path and made `-n` switch disable loading of output in browser in FeedValidator.
- Validation changes:
- Duplicate schedule_id validation now works
- Error on stops that don't pick up, drop off, or act as a timepoint
- Error when day in service period isn't set to "1" or "0"
- More thorough checking of date values
- Error when a stop time departs before it arrives
- Error when a stop time specifies either arrival or departure time, but not both

- FeedValidator now provides nicer HTML output in a browser instead of hard-to-read text.
- Added a directory of example Python scripts using transitfeed.
- kmlparser converts KML lines into GTFS shape.

Move schedule_viewer data files and marey_graph into package gtfsscheduleviewer so that setup.py installs them in a sensible place. Add a hack so py2exe schedule_viewer can find its data files. schedule_viewer --key option will get key from a file if it exists.

Adds kmlparser and kmlwriter utilities for partially converting feeds from and to Google Earth KML format. Also includes several validation improvements, particularly to stop times and route_short_name.