fix named_token

regex pattern does not support sql casting using :: operator for example select mydate::date from mytable;
add test for ticket gh-259

fix :: operator in sql parser
Added Symfony Console suggestion to composer.json
[DBAL-54] Cannot drop schema using IDENTITY strategy in PostgreSQL

DBAL-54 was fixed in commit 3d55dc8eec235c09d64b061456295a1951299496 by
changing SQL queries order. However it was later reintroduced.

This patch uses a different, more future-proof way, approach by using
DROP SEQUENCE ... CASCADE syntax, and thus does not depend on queries order.
[DBAL-492] Fix bug in foreign key comparision when inside a subschema.
[DBAL-445] Add support for key-value based $types maps in
    Connection#insert(),  Connection#update() and Connection#delete(). Closes GH-271
Merge pull request #262 from BenMorel/composer

Add Symfony Console dependency to composer.json
Merge pull request #259 from 25th-floor/fix_sqlparser

fix named_token
Merge pull request #289 from PowerKiKi/DBAL-54-bis

[DBAL-54] [DBAL-420] Cannot drop schema using IDENTITY strategy in PostgreSQL
Fix OFFSET without LIMIT cause MySQL syntax error.
Merge branch 'DBAL-431'
Fix MasterSlaveConnection#delete() signature.
Fix for DBAL-442
Merge pull request #304 from yethee/dbal-442

Fix for DBAL-442
Fix not passing $types to parent connection in MasterSlaveConnection#delete()