Upgrading to YapDatabase 2.7

Bug Fix: Always assign id first so that setting nested relations uses the correct id for foreign key associations

View#index returns both group and index

Fixing travis config

Change log level for missing attributes to debug

Add block wrapper for YapDatabaseViewTransaction findRangeInGroup:usingBlock:blockType

Refactor: Better way to detect pointer type

Bug Fix: Child document without a parent with touches

Relations: Nested belongs_to attribute support

Criteria: Support for overriding operand

Watches: Ability to filter groups based on regex

Bug Fix: Guard against different pointer types

Views: Find index of key in view

Bug Fix: Handle case when a relation is destroyed and touched

Watch for document that does not exist yet