Serializable backing beans

Added implements Serializable;  Added filteredReference in ReferenceBean
for updating JSF
Added ref_num and internalComment in UI

Added ref_num in browse and internal comment in "view/edit" and "add"
functions.  Updated Primefaces to 4.0
Merge branch 'master' of https://github.com/earthchem/reference.earthchem.ieda