ByVal and ByRef variable now have nullable set to false by default (which is also the default in PHP), updates to documentation

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+<h2>Working with variables</h2>
+<p>
+    Variables in PHP are non-typed. A variable can thus hold any possible type:
+    an integer, string, a floating point number, and even an object or an array.
+    C++ on the other hand is a typed language. In C++ an integer variable always 
+    has a numeric value, and a string variable always hold a string value.
+</p>
+<p>
+    When you mix native code and PHP code, you will need to convert the non-typed 
+    PHP variables into native variables, and the other way round: convert native 
+    variables back into non-typed PHP variables. The PHP-CPP library offers the 
+    "Value" class that makes this a very simple task.
+</p>