Allowed maintenance schedule to be imported via data import tool

erpnext/support/doctype/maintenance_schedule/maintenance_schedule.json

@@ -1,6 +1,6 @@
 {
  "allow_copy": 0, 
- "allow_import": 0, 
+ "allow_import": 1, 
  "allow_rename": 0, 
  "autoname": "MS.#####", 
  "creation": "2013-01-10 16:34:30", 
@@ -543,7 +543,7 @@
  "is_submittable": 1, 
  "issingle": 0, 
  "istable": 0, 
- "modified": "2015-10-02 07:38:56.092101", 
+ "modified": "2015-11-09 01:06:37.685780", 
  "modified_by": "Administrator", 
  "module": "Support", 
  "name": "Maintenance Schedule",