1.delete some unused file (UseDemo.java,run.bat,Demo使用说明.txt)
2.change project id to "pipe2wp-hrd" for Migrating to google High
Replication DataStorage
3.add EMF.java and persistence.xml,prepare for Migrating JDO to JPA
4.solve validation error on xsi:noNamespaceSchemaLocation in
jdoconfig.xml
add "static" modifier to EMF.get() for singleton model
change DataNucleus plugin for App Engine to v2.This plugin corresponds
to version 3.0 of the DataNucleus Access Platform, support JPA 2.0
add datastore service access demostrations using lowlevel api,JDO and
JPA