envato/iodized — pull request #33 by gstamp (2014-09-22 03:29:13+00:00)
Title: Add a not operator.

Fixes #23

Looks something like this:

```
{
"operand": "not",
"definition": {
"operand":"is",
"param_name":"session_on",
"value":"true"
}
}
```