Fix gap between actions and model-list (in bs2), fix form-horizontal styling

This pull request removes the awkward gap between the actions and the table in the bootstrap2 ModelView list. It also prevents flask-admin from styling all form-horizontals.

Before:
![2014-12-12 21_16_25-user - example_ sqlalchemy](https://cloud.githubusercontent.com/assets/992533/5422383/303df66c-8244-11e4-845e-31555eb44877.png)

After:
![2014-12-12 21_14_33-model1 - admin](https://cloud.githubusercontent.com/assets/992533/5422356/f44a4778-8243-11e4-94b4-4df384331f7d.png)