Committing update for IO services. Item now receives an IOService, and
IOService receives IReaders and IWriters via OSGi Declarative Services.
MOOSEFileHandler now realizes both the IReader and IWriter interface and
provides implementations that enable dynamic file entry generation
depending on the user-selected input file. This is handled at the Item
and JobLauncher level. 

Signed-off-by: Alex McCaskey <mccaskeyaj@ornl.gov>