Add support for constructors, fix a few property fetching issues
Clean up issue with this variable
Add isInstanceOf to the class entry structure
some refactoring of function calls, implement __DIR__ and __FILE__ magic constants. Also populate OpLines with node attributes...
Add support for debug_backtrace function - including metadata needed
Add support for empty(), shell exec ops and placeholder for error suppression
Clean up copying of attributes at @nikic's request
Fix breaking of tests
Refactor function calls and parameter passing
Add remaining combined assignment operators

I hope I didn't make any c&p mistakes
Improve parameter support...
Merge branch 'master' of https://github.com/ircmaxell/PHPPHP
More parameter passing fixes. Fix return by reference. Add type functions
Add core shim, refactor extensions slightly
clean up alias builder
Add support for Unset (not really) and add constants to shim
Merge cases for numbers and string in output

Also removed initial `$ret = 'unknown';` since it won't be used due to `\LogicException`.
Add get_class() function from PR#9
Add instructions to make test running on Windows
Clean up opline refactoring