Added support for bools; alternate datetime syntax

[rdowne]

Postgres supports booleans, so added that; JSONSchema also often handles datetime with
{ type: 'string', format: 'date-time' } so added logic to deal with that.

[andrglo]

Thanks for this improvement! I ran the test in my computer and thats ok. But, please, fix the line
property.format=='date-time' to use three equals and with spaces around