steal migration number, fix comm_thread_notes body field on stage (bug 917354)

```body``` on stage has column type ```int (11) unsigned``` when it should be a ```text``` field.

It is a ```longtext``` field on dev and prod, but this will just make it a ```text``` field.

comm_thread_notes

+---------------------------------+------------------+------+-----+---------+----------------+
| Field                           | Type             | Null | Key | Default | Extra          |
+---------------------------------+------------------+------+-----+---------+----------------+
| id                              | int(11) unsigned | NO   | PRI | NULL    | auto_increment |
| created                         | datetime         | NO   |     | NULL    |                |
| modified                        | datetime         | NO   |     | NULL    |                |
| thread_id                       | int(11) unsigned | NO   | MUL | NULL    |                |
| author_id                       | int(11) unsigned | NO   | MUL | NULL    |                |
| note_type                       | int(11)          | NO   |     | NULL    |                |
| body                            | int(11) unsigned | YES  | UNI | NULL    |                |
| read_permission_public          | tinyint(1)       | NO   |     | NULL    |                |
| read_permission_developer       | tinyint(1)       | NO   | MUL | NULL    |                |
| read_permission_reviewer        | tinyint(1)       | NO   |     | NULL    |                |
| read_permission_senior_reviewer | tinyint(1)       | NO   |     | NULL    |                |
| read_permission_staff           | tinyint(1)       | NO   |     | NULL    |                |
| read_permission_mozilla_contact | tinyint(1)       | NO   |     | NULL    |                |
| reply_to_id                     | int(11) unsigned | YES  | MUL | NULL    |                |
+---------------------------------+------------------+------+-----+---------+----------------+