Merge pull request #316 from stefk/master

Fixed generated sql for postgres substring function
Delete unnecessary "use PDO" statement
Delete unnecessary "use PDO" statement
Adding failing test for DBAL-522

Demonstrates that NULL parameters are handled incorrectly by the sql parser utils as of 2.3.4
Applying hotfix for DBAL-522
Merge pull request #322 from doctrine/hotfix/DBAL-522-null-parameter-binding

DBAL-522 - SQLParserUtils always throws exceptions on null bound params
Merge pull request #319 from alexpods/patch-1

Delete unnecessary "use PDO" statement
[DBAL-530] Fix foreign key table not supporting "multi"-database support in Sqlite
Fix an instance of doubled words
Fix spelling in sharding docs
Merge pull request #326 from jbafford/doubled-words-fix

Fix an instance of doubled words in the docs
Release 2.4.0-RC1
Bump dev version to 2.4.0
Release 2.4.0-RC1
Bump dev version to 2.4.0
Added deep clone to QueryBuilder
Correcting reference to VarDateTimeType class.

VarDateTime is replaced by correct VarDateTimeType class.
Fix DDC-2470
Fix CS
Merge pull request #332 from FabioBatSilva/DDC-2470

[DDC-2470, DDC-2441] Use column name instead of alias to modify order by clause