2.1.0

• RowCollection::load loads only one entity each time and have the same arguments than selectBy
• Removed Row::load
• Improvements in Row::save()
• Removed Row::empyChanges()
• Removed RowCollection::isCollection() and Row::isCollection()
• Added magic method Row::__call() to execute, for example $post->getComments()
• Removed $changedFields argument in insert because it's useless
• The join argument in select/selectBy only executes real joins
• Throw exceptions on some circunstances