- includes extended default driver connection parameter handling
- minor refactoring

fixes #1183

Close #2182
Close #2277
Close DBAL-939

- fixes platform's COMMENT ON statement support
- implements reverse engineering for column comments
- marks boolean column type commented for distinction

fixes #2182

Merge branch 'fix/#2500-#2497-return-false-from-mysqli-statement-when-nothing-is-fetched-2.5' into 2.5

Close #2500
Close #2497

Allow usage of symfony/console ^3.0 in dev dependencies

Some packages are using symfony/console 3.0 and newer as requirement, and doctrine/dbal works well with this contstrain.

Close #2292

fixes #2291

Close #2286

Close #2442
Close #2436

Closes #2436

So they get passed to the SQLLogger on `Statement::execute`.

Close #2428

Close #2434
Close #2261
Close #2262
Close #2386

Closes #2261
Closes #2262
Closes #2386

Conflicts:
	lib/Doctrine/DBAL/Platforms/DB2iSeriesPlatform.php

fixes #2270

fixes #1206

Fixed incorrect handling of single quotes in SQL-Strings escaped by repeated single-quote (DBAL-1205)

According to the comment

// deleting duplicated foreign keys present on both on the orphanedForeignKey
// and the removedForeignKeys from changedTables

A check must be had on the $removedForeignKey so it does point on the removed table. Currently it does unset all keys removal even the one pointing on other table.