PutObject* refactor

[donatello]

Plan to converge to a smaller set of PutObject functions:

type PutObjectOptions struct {
	UserMetadata       map[string]string
	Progress           io.Reader
	ContentType        string
	ContentEncoding    string
	ContentDisposition string
	CacheControl       string
}

func (c Client) PutObject(bucketName, objectName string, reader io.Reader, objectSize int64,
	opts *PutObjectOptions) (n int64, err error) {
	// TODO
}

func (c Client) FPutObject(bucketName, objectName, filePath string,
	opts *PutObjectOptions) (n int64, err error) {
	// TODO
}

All other put object functions shall be removed.