added yaml mapping documentation of uniqueConstraint
[DDC-2661] Fix bug in YamlDriver not passing options from id to mapField()
Merge branch 'DDC-2661'
Add missing documentation for 2.4 features
Fix RST bug
[DDC-2660] Fix error with NativeSQL, ResultSetMappingBuilder and Associations as Primary Key.
Merge branch 'DDC-2660'
Merge pull request #762 from naitsirch/yaml_reference_ext

YAML mapping documentation of uniqueConstraint
[DDC-2608][DDC-2662] Fix SequenceGenerator requiring "sequenceName" and now throw exception. Fix a bug in quoting the sequenceName.
fixed English grammar
Merge pull request #781 from shieldo/patch-2

fixed English grammar