fix foreign table name quotation in schema table and Sqlite platform and add more robust tests
Merge pull request #338 from deeky666/fix-asset-identfier-quotation

Fix foreign table name quotation in schema table and Sqlite platform
Fixed documentation.

- Fixed docblocks
- Removed return statements on void methods
- Cleaned up unused private / local variables
- Fixed license issues
- Removed SVN leftovers
- Fixed doctrine-project.org links
- Added line breaks before return statements