[+] Added new more tokenizers.
[+] Added sample json file.

Signed-off-by: Jesse Klugmann <jesse@fd-imaging.com>
[+] Added documentation for helpers namespace

Signed-off-by: Jesse Klugmann <jesse@fd-imaging.com>
[+] Completed first parts of the documentation for cejay/document.hpp

Signed-off-by: Jesse Klugmann <jesse@fd-imaging.com>