0.6.2

Bugfixes

• Autocommit the operations done in the marabunta_version table. Previously,
  after an exception, the changes to marabunta_version were rollbacked, which
  is not the expected behavior (it makes the migration restart ceaseless).
  As a side effect, Marabunta now opens 2 connections. The connection opened
  for the adsivory lock cannot commit before the end because it would release
  the lock.