Added section for Stream Service and moved svn

Moved svn.php.net away from myracloud as it is in reality not hosted by them. Also added section for Stream Service to include what they host (excl. nl1.php.net as it is a normal mirror).
Add mirror link back in the footer

As it was in the past and as it was agreed on when providing a mirror for most sponsors
Update thanks.php

Fix a typo, provices -> provides
Merge branch 'pull-request/48'

* pull-request/48:
  Update thanks.php
  Added section for Stream Service and moved svn
mention what SS provides
Merge branch 'pull-request/49'

* pull-request/49:
  Add mirror link back in the footer
Add mirror sponsor logo back to homepage sidebar