Revert "Set the build to support JRE7 and replaced mysql-connector with mariadb connector in the library"

This reverts commit 254a83b592f07b898175e52d07691b0928c4b543.
Revert "Added Mariadb-connector.jar (I think)"

This reverts commit 66ba833bb5231bb63fee29e1d58fc5094a15528e.
Revert "Changed MySQL connector to MariaDB"

This reverts commit 5576ffbe49f44f5c60e4dca9cdb44df1d553a201.