Added support for namespace/schema quoting if it is a reserved keyword.

[guilhermeblanco]

No description provided.

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[beberlei]

@guilhermeblanco tests please

[deeky666]

@beberlei I think he reverted the patch in commit 9b44bc9

[guilhermeblanco]

@beberlei @deeky666 It introduced another problem, so I reverted it.
It's quite hard to easily test on ORM side something on DBAL side without modifying composer, blah blah blah, etc... =
I may revisit this later. =)

[beberlei]

@guilhermeblanco checkout orm with --prefer-source and work on the DBAL repository inside vendor.