[DBAL-590] Remove Column#visit(). The table is responsible for this, because of dependencies.
Fix bug in testsuite where extending from another test causes those tests to be skipped.
Fix more occurances of the extending Test bug, "reactivating" a total of 200 tests. SQLAnywhere is missing and is a bit more annyoing to fix, because of a deep inheritance hierachy.
[DBAL-630] Try reproducing bool with emulated prepares without much success.
Merge branch 'DBAL-630'
Fix test to run on Travis
[DBAL-756] Add new method AbstractPlatform#getVendor().
[DBAL-630] skip test aslong as failure case is not fully understood.
Fix version
Release 2.5.0-BETA2
Bump version to 2.5.0-DEV
Revert "[DBAL-756] Add new method AbstractPlatform#getVendor()."

This reverts commit 5a46f577aa8f019a0670a9aaac2e49c37fae6434.