[DBAL-722] Introduce subclasses for runtime relevant exceptions

[DBAL-544] Fix reference to legacy Query::HYDRATE_* constants in ResultStatement documentation

[DBAL-722] Introduce subclasses for runtime relevant exceptions (NotNull, DuplicateKey, ForeignKey Constraint Violation).

Fix composite primary key introspection on Sqlite

[Mysqli] MYSQLI_SERVER_PUBLIC_KEY only exist for php5.5.0 or creater wit...

[DBAL-563] Add definition of sequence emulated identity platforms

Add documentation for query builder insert operation

Fix some more CS

[DBAL-555] Fix using Identifier assets and quoting

[DBAL-717] Fix bug in MasterSlaveConnection with keepSlave option and switch back after transaction.

the test testKeepSlaveBeginTransactionStaysOnMaster does not begin a transaction, I have put a begin transaction, and now it fails,

the fix is here, if it makes sense
https://github.com/ananda-agrawal/dbal/commit/eb9262afb3955e4974d5a713b495a544b66a5cf7

Besides the table name, the column name has to be quoted in column comments

[DBAL-320] Add insert operation to QueryBuilder

 - name platform 'sqlsrv' nonexistent and E_NOTICE index array.

Update TestInit.php for new autoloading stuff

Fix deprecated CLOB type declaration in SQL Server platform

[DBAL-555] replace a bunch of occurances of $diff->name and $diff->newName with quoted identifier version.