Lovely-esdb

================

- added ObjectProperty

- complete refactoring of the document class

- added support for multiple classes using the same document index

================

- fix: bulk implementation must use `primary_key` property instead of `id`

- do not allow multiple primary key properties on documents

- added `primary_key` property to document

================

- added possibility to set custom getter/setter on properties

- do not invoke property setter when loading Document form database

================

- bulk updates with conflict resolution

- updating only initialized properties

- added Bulk class

================

- Document.search now returns the full ES response
Note: this is a backward incompatibility.

================

- apply default values not in init method but when values are read or written

- do not initially call default() property methods on reading operations