quote old column name in rename column SQL
Adding hhvm-nightly and PHP 5.6 to the build matrix
Travis doesn't need to manually upgrade HHVM in builds
Avoiding mocking `PDOException` as of sebastianbergmann/phpunit-mock-objects#169
Merge pull request #602 from doctrine/feature/hhvm-nightly-php-5.6

HHVM nightly and PHP 5.6 in builds
Properly instantiate var and fix spelling.
Merge pull request #584 from JeroenDeDauw/SQLServerPlatform

Properly instantiate var and fix spelling
Merge pull request #545 from deeky666/DBAL-835

[DBAL-835] Quote old column name in rename column SQL