Make date and time types throw exception when invalid values are passed to convertToDatabaseValue

drop php 5.3 support

requiresSQLCommentHint in DateIntervalType

According to comment https://github.com/doctrine/dbal/pull/854#issuecomment-126935212

Typo fixes

[DBAL-1220] Fix dropping database with active connection on PostgreSQL

Fixed correct value in "Doctrine\Tests\DBAL\Schema\Visitor\SchemaSqlCollectorTest"

use REGEXP operator for sqlite

Add test for MariaDB 5.5, 10.0 and 10.1 on Travis

Allow testing with doctrine/common 2.6

Fixed typo

Added Postgres 9.4 platform (DBAL-1143)

MySQL getListTableForeignKeysSQL: use current database if null passed

Features and changes:
* jsonb can be used with: options={"jsonb"=true}
* OVER is no longer reserved
* LATERAL is now reserved

DateInterval Type

Travis: Switch to container-based infrastructure

Ref: https://github.com/doctrine/doctrine2/pull/1466

return result from Doctrine\DBAL\Connection::transactional()

Fix call on non-object in ping() with PDO wrapper

Remove git submodules