support for multiple test variables and var qualifiers in user-defined type classes
Added timestamp to TIRCEvent
Fixed http header parsing issue

If second half of http header line was empty, server would crash with
EInvalidIndex

https://gist.github.com/onionhammer/7487452
improvements for the `is` operator; implemented the type lifting rule in user-defined type classes
simple unit test and better documentation for the user defined type classes
Merge pull request #670 from onionhammer/master

Added timestamp to TIRCEvent