Move Subcommand instantiation to run

To prevent duplication of error catching

include/sardine.py

 class App:
 
     def __init__(self, cmdargs):
+        self.cmdargs = cmdargs
         self._set_pluginpath()
-        try:
-            self.subcommand = Subcommand(cmdargs, self.pluginpath)
-        except SardinePluginError as e:
-            self.die(e)
 
     def _set_pluginpath(self):
         mypath = os.path.dirname(os.path.realpath(sys.argv[0]))
 
     def run(self):
         try:
+            self.subcommand = Subcommand(self.cmdargs, self.pluginpath)
             print self.subcommand.get_output()
         except SardinePluginError as e:
             self.die(e, 10)