couchdbkit.ext.django.schema thows import error with Django 1.7

couchdbkit.ext.django.schema thows import error because get_verbose method is removed from django.db.models.options

fix:
remove

``` python
from django.db.models.options import get_verbose_name
```

and include get_verbose_name from previous Django version

``` python
# Calculate the verbose_name by converting from InitialCaps to "lowercase with spaces".
get_verbose_name = lambda class_name: re.sub('(((?<=[a-z])[A-Z])|([A-Z](?![A-Z]|$)))', ' \\1', class_name).lower().strip()
```

Start at couchdbkit.ext.django.schema and reproduce the import with Django 1.7. Compare its get_verbose_name import with the compatibility implementation shown in the issue; done when the module imports without the reported error under Django 1.7.

Written by the indexing model from the issue text.