Added current upstream versions of typo3_dummy.

* Masked previous versions of typo3_dummy (4.5.22, 4.6.15 and 4.7.7)
* Removed ancient versions of typo3_dummy (4.5.15, 4.6.8 and 4.7.2)
* Added current upstream versions of typo3_dummy (4.5.23, 4.6.16 and 4.7.8). Official announcement can be found
here: http://typo3.org/news/article/typo3-cms-4523-4616-478-and-602-released/
Added changed Manifest
Added current upstream versions of typo3_src

* Masked previous versions of typo3_src (4.5.22-r1, 4.6.15-r1 and 4.7.7-r1)
* Added current upstream versions of typo3_src (4.5.23, 4.6.16 and 4.7.8)
* Removed ancient versions of typo3_src (4.5.15, 4.6.8 and 4.7.2)
* Added updated manifest