Namespacing

Should the namespacing be done like this:

``` php
namespace PHPWord;

class PHPWord
{}
```

which will result in using the lib like this: `new PHPWord\PHPWord();`

OR

``` php
namespace PHPOffice\PHPWord;

class PHPWord
{}
```

which will result in using the lib like this: `new PHPOffice\PHPWord\PHPWord();`

Both of which are PSR-0 and PSR-4 compliant.
