Remove outdated fixture_gen files

http://github.com/alex/fixture_generator has not been updated since
Django 1.2.

symposion/reviews/fixture_gen.py

@@ -1,9 +0,0 @@
-from django.contrib.auth.models import Group
-
-from fixture_generator import fixture_generator
-
-
-@fixture_generator(Group)
-def initial_data():
-    Group.objects.create(name="reviewers")
-    Group.objects.create(name="reviewers-admins")

symposion/speakers/fixture_gen.py

@@ -1,29 +0,0 @@
-from django.contrib.auth.models import User
-
-from fixture_generator import fixture_generator
-
-from symposion.speakers.models import Speaker
-
-
-@fixture_generator(Speaker, User)
-def speakers():
-    guido = User.objects.create_user("guido", "guido@python.org", "pythonisawesome")
-    matz = User.objects.create_user("matz", "matz@ruby.org", "pythonsucks")
-    larry = User.objects.create_user("larryw", "larry@perl.org", "linenoisehere")
-    
-    Speaker.objects.create(
-        user=guido,
-        name="Guido van Rossum",
-        biography="I wrote Python, and named it after Monty Python",
-    )
-    Speaker.objects.create(
-        user=matz,
-        name="Yukihiro Matsumoto",
-        biography="I wrote Ruby, and named it after the rare gem Ruby, a pun "
-            "on Perl/pearl.",
-    )
-    Speaker.objects.create(
-        user=larry,
-        name="Larry Wall",
-        biography="I wrote Perl, and named it after the Parable of the Pearl",
-    )