Graphene-django-extras

Fixed typographic bug on converter.py

1. Added **Binary** graphql type. A BinaryArray is used to convert a Django *BinaryField* to the string form.
2. Added **CACHE_ACTIVE** and **CACHE_TIMEOUT** config options to **GRAPHENE_DJANGO_EXTRAS** settings for activate cache and define a expire time. Default values are: CACHE_ACTIVE=False, CACHE_TIMEOUT=300 (seconds). Only available for Queries.
3. Updated **Date** directive for use with Django *TimeField*, *DateField*, and *DateTimeField*.

1. Added some useful **Directives** to use on queries and fragments.
2. Fixed error on **DjangoFilterPaginateListField** resolve function.
3. Fixed bug with default *PaginationClass* and **DjangoFilterPaginateListField**.

Fixed some minors bugs