remove import and external_feed_id from calendar_events.

removed unused code to import an ical feed into a calendar,
and dropped the external_feed_id from the calendar_events
table because it isn't being used.

Change-Id: I9c093f4f2f63cc503d74bfc1cde089bf24ea0d73
Reviewed-on: https://gerrit.instructure.com/19615
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Eric Berry <ericb@instructure.com>
QA-Review: Zach Pendleton <zachp@instructure.com>
Product-Review: Marc LeGendre <marc@instructure.com>
QA-Review: Marc LeGendre <marc@instructure.com>

db/migrate/20130416170936_drop_calendar_events_external_feed_id.rb

@@ -0,0 +1,11 @@
+class DropCalendarEventsExternalFeedId < ActiveRecord::Migration
+  tag :postdeploy
+
+  def self.up
+    remove_column :calendar_events, :external_feed_id
+  end
+
+  def self.down
+    add_column :calendar_events, :external_feed_id, :integer
+  end
+end

lib/external_feed_aggregator.rb

@@ -62,21 +62,6 @@ class ExternalFeedAggregator
         rescue
         end
       end
-    elsif feed.feed_type == 'ical'
-      require 'icalendar'
-      begin
-        cals = Icalendar.parse(body)
-        tally = []
-        entries = []
-        cals.each do |cal|
-          tally += feed.events
-          entries += feed.add_ical_entries(cal)
-        end
-        @logger.info("#{tally.length} ical events found")
-        @logger.info("#{entries.length} new entries added")
-        return true
-      rescue
-      end
     end
     false
   end