Fix for issue 556 and 591 (#590)

* version argument in manticore

* Fix 591 - Exception Handler

manticore/__main__.py

@@ -53,6 +53,8 @@ def parse_arguments():
     parser.add_argument('--workspace', type=str, default=None,
                         help=("A folder name for temporaries and results."
                               "(default mcore_?????)"))
+    parser.add_argument('--version', action='version', version='Manticore 0.1.5',
+                         help='Show program version information')
 
     parsed = parser.parse_args(sys.argv[1:])
     if parsed.procs <= 0:

manticore/core/cpu/abstractcpu.py

@@ -789,7 +789,7 @@ class Cpu(Eventful):
         emu = UnicornEmulator(self)
         try:
             emu.emulate(insn)
-        except e:
+        except Exception as e:
             raise InstructionEmulationError(str(e))
         finally:
             # We have been seeing occasional Unicorn issues with it not clearing