Improvement to develop behaviors
PropelColumnTypes class used by bindValue method
optimized generated classes
add "isser" methods for boolean columns
Fixed MigrationManager::getMigrationDir call which should be MigrationManager::getWorkingDir instead
Merge pull request #552 from mpscholten/bug-fix-for-531

Fixed #531 "Missing method 'getMigrationDir' in MigrationManager"
Merge pull request #546 from nekufa/patch-1

PropelColumnTypes class used by bindValue method
Merge pull request #547 from gharlan/isser-methods

Add "isser" methods for boolean columns
Merge pull request #541 from gharlan/optimized-generated-classes

optimized generated classes
Update UniqueValidator.php

        $object     = $this->context->getRoot();
        $className  = get_class($object);

are not needed because Symfony\Component\Validator\ExecutionContext provides a getClassName() method. Also, $this->context->getRoot() was returning a Form object, which does not have the TABLE_MAP constant defined.
Merge pull request #555 from dsoares/patch-1

Update UniqueValidator.php
added ConnectionInterface type hints
removed SqlConnectionInterface
travis: use fast_finish option
Merge pull request #556 from gharlan/travis-fast-finish

Travis: use fast_finish option
Merge pull request #537 from gharlan/sql-connection-interface

ConnectionInterface vs. SqlConnectionInterface
fixed docs, type hints and imports
fixed TimestampableBehaviorTest
Merge pull request #559 from gharlan/fixed-timestampable-behavior-test

Fixed TimestampableBehaviorTest
Merge pull request #558 from gharlan/fixed-docs-typehints-imports

fixed docs, type hints and imports