Ovp-organizations

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* Fix install_requires

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* Implement organization patch routes

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* Include templates on package

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* Implement slug field on Organization
* Rename .published_at, .modified_at, .deleted_at, .created_at to .published_date, .modified_date, .deleted_date, .created_date
* Update test suite coverage to 100%
* Add invite, revoke invite, join, leave and remove member routes and emails
* Add image and cover do organization

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* Make address field not required on OrganizationCreateSerializer

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* Return address field on OrganizationSearchSerializer