correction in Postgres search, don't coalesce number/date fields
* QueryData extends Serializable to make a Query serializable
* GAE: bug correction for GaeMappingUtils.getKey with a NULL key
value (now returns null)
* JDBC: bug correction in stateful mode, if the statement is
closed, it is rebuilt from scratch (added
QueryOptionJdbcContext.isClosed function)
* added all stuff for Query JSON dump/restore (might evolve in the
future) + unit tests
* Query is now ignored in Json serialization
* new @EmbedIgnore to ignore a field from Json serialization
added model inheritance management (table per concrete class mode) +
documentation +
updated inheritance doc
modified release-notes
* updated inheritance.textile
* added @InheritFilter(removeFields={})

Change-Id: If571e91897516cd116777af7ab9583f1a0b6a9dc
updated inheritance.textile
@EmbedIgnore correction: removed the unneeded value()
updated inheritance.textile
update readme.textile
updated README.textile
Edited README.textile via GitHub
Edited README.textile via GitHub
Edited README.textile via GitHub
Edited README.textile via GitHub
Edited README.textile via GitHub
Edited README.textile via GitHub
Edited README.textile via GitHub