Implemented a retry to get the right split test variation in race conditions

- Used a recursion pattern to avoid code duplication
- Thrown exception if the insert fails a second time to avoid endless loops
Docu
Merge branch 'master' of github.com:cargomedia/CM into issue-1450
introduce smarty_function_load_less:

- add CM_Asset_Css_File to be able to render single file
Extend only from single internal.php file
Check if file exists
Remove outdated vhost docu
Update to phpunit 4.3
Merge pull request #1498 from njam/phpunit-4.3

Update to phpunit 4.3
Merge pull request #1497 from njam/docu-vhost

Remove outdated vhost docu
Upgrade to jquery 2.1.1.
Update to jquery-ajax-retry 0.2.7.
Update to jquery.blockUI 2.70.
change app-time to UTC
Update jquery.imagesLoaded to 3.1.8.
Update select2 to 3.5.2.
Update jquery.transit to 0.9.12.
Merge pull request #1483 from vogdb/issue-1483

Update jquery.js
Merge branch 'master' of github.com:cargomedia/CM into issue-1503
Merge pull request #1503 from vogdb/issue-1503

Update trivial front-end libraries.