Added README.txt to teach how to build with DQuest
DQSharedList - Changed the storage format , now it use QList < QSharedPointer<DQAbstractModel> > .
[Bug Fix] DQSharedList::clear() - It should not clear the binded metaInfo
Added a new function : dqmodel_cast() -  Returns the given abstract model cast to type T* if the model is of type T; otherwise returns 0. If model is 0 then it will also return 0.
DQ_MODEL : It will add a new function to DQModel - staticMetaInfo()

It is the static version of the metaInfo() function. You don't  need to create it for the derived class as long as you have  put the DQ_MODEL macro line in the class declaration.
dqmodel_cast() - Changed the argument type to make it similar to qobject_cast
DQList - Added append(DQList) , last() ,isEmpty()
DQWhere - Added example usage in the document
Extra test case to prove that multiple database connection works.
Added DQSharedQuery::isNull() and deprecate DQSharedQuery(DQConnection connection)  constructor

The null object concept has been documented in DQSharedQuery.
DQConnection - Defined the null state and added isNull() function.
DQModel - Do not set default connection in constructor. 

When a function require the access of connection , it will check is current connection null , if yes , then it will set it to default connection.
DQConnection -  Changed the behavior / definition of defaultConnection() function for improve the multiple database access's coding affort.

Now the defaultConnection() will return the default connection for specific connection instead of a global default connection
DQConnection : Deprecate setToDefaultConnection() , and replaced by setDefaultConnection(DQModelMetaInfo*)

Change the default connection for specific model
DQSharedList::isEmpty() is changed to const
Added Ubuntu/Debian packaging script
mv src/dquest.pro => dquest.pro
Updated README.txt for how to build Ubuntu/Debian package
Updated the changelog to add the 0.2 release information
Added src/priv for holding private class , which should not be usable from user.