Included a case for bound forms in test_modelform.
Tidying doc line formatting.
Basic support for ModelForms (#135).

Still working to support `Relationship`s in forms.
Up'd Travis to test against Neo4j 1.9.M05.
Added internal auto-pagination for queries.

This prevents eg Person.objects.all() from loading 10k people objects
into memory at once.
Adjusted the relationship tests to agree with...

the QuerySet API.
Unified model and relationship querysets.
Removed the old commented relationship queryset.

Closes #141.