Attachment Bug Fix (#471)

Fixes issue with cropped attachments.

db/db_mysql/migrations/20161202153627_AttachmentFix.sql

@@ -0,0 +1,9 @@
+
+-- +goose Up
+-- SQL in section 'Up' is executed when this migration is applied
+ALTER TABLE attachments MODIFY content LONGTEXT;
+
+-- +goose Down
+-- SQL section 'Down' is executed when this migration is rolled back
+
+ALTER TABLE attachments MODIFY content TEXT;