Committing updates to Item, JobLauncher, JobLaunchAction, and
MooseLauncher. Implemented JobLauncher.getWorkingDirectory() to let
subclasses get a reference to the absolute path of the
iceLaunch_timestamp working directory. 

Removed code in JobLaunchAction.launchLocal that moves generated files
into the default project space. Added code to JobLauncher.launchRemotely
that creates a local remoteIceLaunch_timestamp directory to serve as a
place for downloaded files from the remote host. 

Added file creation/copying/moving functionality to the Item.
Implemented copyFile(s), moveFile(s), getFiles, and deleteDirectory that
subclasses can utilize for simulation file manipulation. 

Reimplemented MOOSELauncher.updateResourceComponent to use these new
Item methods. 

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