burndown schema migrations (#1727)

Don't bother looking at the diff.   This is the result of removing all prior migrations, and then doing a ```manage.py schemamigration --initial c2g```.  It's a quirk that 0001_initial.py shows up as a mod instead of a delete / add, but fine.

I tested the method in #1727 on my machine and it worked fine (with a couple tweaks).  Afterwards my south_migrationhistory looked like this:

```
mysql> select * from south_migrationhistory;
+----+----------+------------------+---------------------+
| id | app_name | migration        | applied             |
+----+----------+------------------+---------------------+
|  1 | c2g      | 0001_initial     | 2013-01-24 01:41:19 |
|  2 | djcelery | 0001_initial     | 2013-01-24 01:42:05 |
|  3 | djcelery | 0002_v25_changes | 2013-01-24 01:42:05 |
|  4 | djcelery | 0003_v26_changes | 2013-01-24 01:42:05 |
|  5 | djcelery | 0004_v30_changes | 2013-01-24 01:42:05 |
+----+----------+------------------+---------------------+
```