Issue 303: The feed_info.txt proposal has been officially adopted

This patch does the bulk of the work of supporting feed_info.txt in the main package.  Reviewed in http://codereview.appspot.com/5240052/

extensions/googletransit/README

@@ -13,16 +13,6 @@ List of changes to the default behavior:
     "add agency_id column to fare_attributes.txt" at
     http://groups.google.com/group/gtfs-changes/browse_frm/thread/4e74c23bb1f80480
   - adds new field 'agency_id' and function ValidateAgencyId()
-* extensions.googletransit.FeedInfo:
-  - new class for validating feedinfo.txt as poposed in
-    https://sites.google.com/site/gtfschanges/spec-changes-summary#feed_info
-  - validates fields 'feed_publisher_name', 'feed_publisher_url', 'feed_lang',
-    'feed_timezone', 'feed_valid_from' and 'feed_valid_until'
-  - recognizes field 'feed_version'
-  - The valid dates range specified by 'feed_valid_from' and 'feed_valid_until'
-    is only used to check the feed validity. It's not used for other purposes.
-    In particular, services and service exceptions are not dropped or reduced if
-    they are defined outside this valid dates range.
 * extensions.googletransit.Route
   - extension of transitfeed.Route as proposed in
     https://sites.google.com/site/gtfschanges/spec-changes-summary#routes and
@@ -32,17 +22,6 @@ List of changes to the default behavior:
     extensions.googletransit.Stop for validating field vehicle_type.
     The HVT values are derived from the European TPEG standard, see discussion
     at http://groups.google.com/group/gtfs-changes/msg/ed917a69cf8c5bef
-* extensions.googletransit.Schedule:
-  - extension of transitfeed.Schedule for being able to validate
-    interrelationships between the new fields and data sets introduced in this
-    extension
-  - new feed_info variable and AddFeedInfoObject() method in order to be able to
-    register a extensions.googletransit.FeedInfo object in the Schedule
-  - validates FeedInfo.feed_lang against Agency.agency_lang
-  - validates FeedInfo.feed_timezone against Agency.agency_timezone
-  - checks that all Agencies have the same timezone
-  - overrides ValidateFeedStartAndExpirationDates() in order to take
-    FeedInfo.feed_valid_from and FeedInfo.feed_valid_until into account
 * extensions.googletransit.Stop
   - extension of transitfeed.Stop as proposed in
     https://sites.google.com/site/gtfschanges/spec-changes-summary#stops

extensions/googletransit/__init__.py

@@ -16,8 +16,6 @@
 
 from agency import *
 from fareattribute import *
-from feedinfo import *
 from route import *
-from schedule import *
 from setup_extension import *
 from stop import *

extensions/googletransit/setup_extension.py

@@ -18,9 +18,7 @@
 
 import agency
 import fareattribute
-import feedinfo
 import route
-import schedule
 import stop
 
 def GetGtfsFactory(factory = None):
@@ -33,18 +31,9 @@ def GetGtfsFactory(factory = None):
   # FareAttribute class extension
   factory.UpdateClass('FareAttribute', fareattribute.FareAttribute)
 
-  # FeedInfo class
-  factory.AddMapping('feed_info.txt',
-                     {'required': False, 'loading_order': 100,
-                      'classes': ['FeedInfo']})
-  factory.AddClass('FeedInfo', feedinfo.FeedInfo)
-
   # Route class extension
   factory.UpdateClass('Route', route.Route)
 
-  # Schedule class extension
-  factory.UpdateClass('Schedule', schedule.Schedule)
-
   # Stop class extension
   factory.UpdateClass('Stop', stop.Stop)