Bug fix / add namespace / drop PHP-4

#Breaking changes:

* added namespace -> PHPDebugConsole is now
instantiated via `new \bdk\Debug\Debug();` or
`\bdk\Debug\Debug::getInstance();`
* Dropped PHP-4 support.. if there's
demand, I will fork the code for a PHP-4 compat version
* removed
"singleton cheat":

    /\*\*
     \* Without going into too many
details, this behavior has changed
     \*/
    $debug1 = new
Debug();
    $debug2 = new Debug();
    /\*\*
     \* Previously
this would create two separate instances,
     \*  but they behaved as
one since behind the scenes they
     \* shared the same config / log
/ properties
     \* Now you get two separate instances..
     \*
so a static getInstance() method has been added
     \*/

Fixed #6 -
bug in error notification email code echoing $_POST