add read_comment_count_to_discussion_read_logs
Merge pull request #917 from loomio/add-read-comment-count-to-discussion-read-logs

add read_comment_count to discussion_read_logs
comment out data migration to prevent a read lock
Merge branch 'master' of github.com:loomio/loomio into refactor/discussion-readers

Conflicts:
	db/migrate/20130728044913_add_read_comments_count_to_discussion_read_logs.rb
	db/schema.rb
move data migration into upgrade tasks