Implementation issue #98
Add Php::class_exists implementation.
Add Php::is_a implementation.

Add is, isSubClassOf for Php::Value.
Add Php::is_a implementation.
Add Php::is_subclass_of implementation.
Fixed issue #107
Fixed Object Constructor.

The old copy constructor of Php::Object forgot the call("__construct")
Change C99 VLA C++ dynamic array
Merge branch 'issue#98' of https://github.com/andot/PHP-CPP into andot-issue#98
renamed fastcall.cpp to eval.cpp, and moved the Php::eval() definition to the call.h header file
minor change so that phpcpp.h does not have any changes in this project
no more exceptions for wrong eval()'ed code
Merge branch 'andot-issue#98'
Merge branch 'class_exists' of https://github.com/andot/PHP-CPP
modifed class_exists function to work with a char* without having to convert it into a std::string
removed space from docblock
compile issues
autoload check had to be exactly the other way around
Merge branch 'is_a' of https://github.com/andot/PHP-CPP
added Value::subclassOf(), and implemented Php::is_a() and Php::is_subclass_of()
removed includes for fastcall.h
fixed compile issues