Record.json with correct data types

[eightysteele]

Right now all values in Record.json are string. Should be correctly types so that day for example is 1 and not "1".

[eightysteele]

@tucotuco: Can you gen a mapping between Darwin Core name and its type (string, float, int)?

[tucotuco]

pushed @67bb765

[eightysteele]

Thanks @tucotuco. Re-opening issue since I still need to fold that into the code.