Merge pull request #23 from FearsomeFoursome/master

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Merge pull request #24 from FearsomeFoursome/master

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SQL and MYSQL connection fixed
SQL and MYSQL connection fixed
corrected Address foreign keys;
corrected table names to remove '3' for sql server compatibility;
removed CustomerID from AddressDB;
reverted CommonConnection class;
Merge and fix conflicts
Merge all the things