Add caching to database calls

[bjagg]

Problem:
There is no caching for database calls. News Reader data is ideal with few updates and lots of reads.

Solution:
Add caching to HibernateNewsStore.java for the following:

• NewsConfiguration (x3)
• NewsSet
• NewsDefinition (x3)

There are several getters and the classes form a heirarchy: configuration > set > definition.

Some time will be needed to sort the caching strategy.

[bjagg]

Method review:

1. storeNewsDefinition: all caches flushed
2. storeNewsConfiguration: all caches flushed
3. getNewsConfigurations: cache<subscribeId, list NewsConfiguration>
4. getUserDefinedNewsConfiguration: cache<(setId,visibleOnly), list UserDefinedNewsConfiguration>
5. getPredefinedNewsConfigurations: cache<(setId,visibleOnly), list PredefinedNewsConfiguration>
6. getPredefinedNewsConfigurations: cache<(setId=-1,visibleOnly = false), list PredefinedNewsConfiguration>
7. getHiddenPredefinedNewsDefinitions: cache<(setId, roles), list PredefinedNewsConfiguration>
8. initNews: all caches flushed
9. ...

[bjagg]

Also cache NEWS_PARAMETER table

[bjagg]

Spring dependencies already included.

Caching manager already defined: https://github.com/uPortal-Project/NewsReaderPortlet/blob/master/src/main/resources/context/applicationContext.xml#L40

Need to add cache annotation scan tag to application context still.