Load admin views settings class from XADMIN_CONF module, and support exclude builtin plugins use XADMIN_EXCLUDE_PLUGINS attr in django settings.
Use 'info' style for active site menu panel group item.
Get app title from app module ``app_title`` or ``verbose_name`` attar.

For example:

in app/__init__.py

```python
from django.utils.translation import ugettext_lazy as _

app_title = _('IDC Management')
```
Bump up to 0.4.0