Same-level indented soft wrap for Haml

TM2 indented soft wrap just makes too much sense for Haml, it really ought to be the default.

### After

![screen shot 2013-07-18 at 14 50 18](https://f.cloud.github.com/assets/430/821892/67dbee3e-efe3-11e2-9536-2144826d8edb.png)

### Before

![screen shot 2013-07-18 at 14 49 12](https://f.cloud.github.com/assets/430/821891/637a8ea4-efe3-11e2-9cd8-1f8872001cd7.png)