[DBAL-249] result cache with fetch type PDO::FETCH_COLUMN

[Mysql Platform] Added mapping for binary and varbinary.

[mysqli] Added support for fetchAll(PDO::fetch_column)

[mysqli] Added mysqli driver to travis tests.

PHPDoc blocks improvments + 1 CS Fix

[DBAL-166] Default MySQL to UTF8/utf8_general_ci. Allow to set default table options from SchemaConfig.

Updated OCI8Connection parameter name in order to separate oracle pooling handling with oci8 persistent connections

Connection quote() ignores returned value from getBindingInfo()

Adding support for datetimeoffset for MSSQL Server 2008

Fix: fix an error because of which instead of loading \Symfony\Component...

Adding PDO::FETCH_COLUMN support to OCI8 fetchAll method using the fetch structure OCI_FETCHSTATEMENT_BY_COLUMN.

missing call to logger in Connection->exec(), cleanups

Allow empty host to PDOOracle