Fixed file objects with hyphen issue (ucfopen#647 ) and added test cases #650

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nayanpaa:issue/647-File-objects-get-attribute-content-type-which-must-be-accessed-through-getattrnayanpaa/canvasapi:issue/647-File-objects-get-attribute-content-type-which-must-be-accessed-through-getattrCopy head branch name to clipboard