Add command to fetch git repos

trans/management/commands/updategit.py

+from django.core.management.base import BaseCommand, CommandError
+from trans.models import SubProject
+from optparse import make_option
+
+class Command(BaseCommand):
+    help = 'updates git repos'
+    args = '<project/subproject>'
+    option_list = BaseCommand.option_list + (
+        make_option('--all',
+            action='store_true',
+            dest='all',
+            default=False,
+            help='Force rereading files even when they should be up to date'),
+        )
+
+    def handle(self, *args, **options):
+        if options['all']:
+            for s in SubProject.objects.all():
+                s.update_branch()
+                s.create_translations()
+        for arg in args:
+            prj, subprj = arg.split('/')
+            s = SubProject.objects.get(slug = subprj, project__slug = prj)
+            s.update_branch()
+            s.create_translations()
+