Version 1.8.0

New functionality and features

• Add Search API

Other Changes

• Add test_helper.py
• Add call_json_api to api.py.
• Add logger to cloudinary.
• Mock start_at param test
• Add mocked test for ocr param in update
• Add gravity ocr value tests
• Add mocked test for ocr param in upload
• Merge pull request #94 from rubengrill/fix-unicode-encode-error-cloudinary-url
• Fix UnicodeEncodeError in utils.cloudinary_url