Added new syntax named 'CBLOCK' . The content in `%{ }%` will copied into the generated .c file

Hi.

I have implement a new syntax named 'CBLOCK'.
The idea is inspired by Mozilla's XPIDL C++ Block . http://www-archive.mozilla.org/scriptable/xpidl/idl-authors-guide/keywords.html

Syntax is 
```
%{
// This text is in CBLOCK.
}%
```

The CBLOCK  copied text into generated .c file.
It is useful and help us to call C functions more easier, and have ability to using 3rd libs in zephir.

The CBLOCK before `namespace` `class` will copied CONTENT to generated .c file and after headers .

The CBLOCK inside method statement, will copied CONTENT to generated .c file `inline` (AT IT's Position)

Here is unit-test for example:
```
**
 * CBLOCK tests
 /* asfas
 */

%{
// top statement before namespace, add to after headers
#define MAX_FACTOR 40
}%

namespace Test;

%{
// top statement before class, add to after headers
// test include .h
#include "kernel/require.h"
}%

%{

// c implement fibonacci
static long fibonacci(long n) {
        if (n < 2) return n;
        else return fibonacci(n-2)+fibonacci(n-1);
}

}%

class Cblock
{
        public function testCblock1()
        {
                int a = 0;
                %{
                a = MAX_FACTOR;
                }%

                return a;
       }

        public function testCblock2()
        {
            long a = 0;

            %{
            a = fibonacci(MAX_FACTOR);
            }%

            return a;
        }
```

AND Generated .c file below: 
```
#ifdef HAVE_CONFIG_H
#include "../ext_config.h"
#endif

#include <php.h>
#include "../php_ext.h"
#include "../ext.h"

#include <Zend/zend_operators.h>
#include <Zend/zend_exceptions.h>
#include <Zend/zend_interfaces.h>

#include "kernel/main.h"

// top statement before namespace, add to after headers
#define MAX_FACTOR 40


// top statement before class, add to after headers
// test include .h
#include "kernel/require.h"



// c implement fibonacci
static long fibonacci(long n) {
        if (n < 2) return n;
        else return fibonacci(n-2)+fibonacci(n-1);
}




/**
 * CBLOCK tests
 /* asfas
 */
ZEPHIR_INIT_CLASS(Test_Cblock) {

        ZEPHIR_REGISTER_CLASS(Test, Cblock, test, cblock, test_cblock_method_entry, 0);


        return SUCCESS;

}

PHP_METHOD(Test_Cblock, testCblock1) {

        int a = 0;



                a = MAX_FACTOR;

        RETURN_LONG(a);

}

PHP_METHOD(Test_Cblock, testCblock2) {

        long a = 0;



            a = fibonacci(MAX_FACTOR);

        RETURN_LONG(a);

}
```