Add 'get_all' request to handle paging. Add retries. Get all emails of person.

[maaikez]

New get_all function to handle paging and get all the records.
Add retries and interval between retries.
Request to get all emails of a person.
Change parse function so _request function can also be used to download files. Did not add the file download function yet.

[Arkaikus]

client._parse method is returning bytes instead of dict