Fixes login check
Implements new version of the TYPO3 customer manager
Adds sr_feuser_register as required TYPO3 extension (for TYPO3 customer manager)
Update to latest Arcavias core
Adds latest fixes from Arcavias core
Merge pull request #52 from nsendetzky/master

Implements new customer manager for TYPO3 users and makes their data available in the checkout process