plugins tickets import, jp (ticket/import): implemented mapping:

- mapping is an option allowing do map imported field to a specific field in the newly created item
- importers can now use complexe data types in options using JSON

src/plugins/plugin_import.py

@@ -26,6 +26,7 @@ from sat.core import exceptions
 from functools import partial
 import collections
 import uuid
+import json
 
 
 PLUGIN_INFO = {
@@ -110,6 +111,11 @@ class ImportPlugin(object):
                 options[option] = C.bool(options[option])
             except KeyError:
                 pass
+        for option in import_handler.JSON_OPTIONS:
+            try:
+                options[option] = json.loads(options[option])
+            except ValueError:
+                raise exceptions.DataError(_(u'invalid json option: {name}').format(name=option))
         return self.doImport(client, import_handler, unicode(name), unicode(location), options, pubsub_service or None, pubsub_node or None)
 
     @defer.inlineCallbacks