adde icecast file to gem library

db/manifest

@@ -81,3 +81,4 @@ notification_band_invite.sql
 band_photo_filepicker.sql
 bands_geocoding.sql
 store_s3_filenames.sql
+icecast.sql

ruby/lib/jam_ruby.rb

@@ -83,6 +83,7 @@ require "jam_ruby/models/mix"
 require "jam_ruby/models/claimed_recording"
 require "jam_ruby/models/crash_dump"
 require "jam_ruby/models/isp_score_batch"
+require "jam_ruby/models/icecast_limit"
 
 include Jampb