Create proper validator for output json ld files

[mitfik]

The idea is to have simple validation tool which is able to verify that the output is correct and follows the specification.

It would be used partially as a testing tool and helper for everyone who would try to verify their objects.

[blelump]

@mitfik , define the meaning of valid object.

[mitfik]

This would be part of the spec which is in progress soon we would get it out to work on. Basically the 'valid' means what is the least amount of attributes which makes sens to use the file.