Update project dependencies and remove fixed versioning when not needed

The previous commit uses url syntax from Django 1.5, which is incompatible with earlier versions. Bump the Django version
and use the stable/1.5.x git branch until it's officially released.

requirements.txt

@@ -1,9 +1,8 @@
-Django==1.4.4
-South==0.7.4
-Pillow==1.7.7
-django-tastypie==0.9.12
-django_compressor==1.2
-cssmin==0.1.4
-jsmin==2.0.2
--e git://github.com/hcarvalhoalves/django-taggit.git@e0f9642d7b94c8e6c0feb520d96bb6ae4d78a4d0#egg=django-taggit
-
+-e http://github.com/django/django/tarball/stable/1.5.x#egg=Django
+South
+Pillow
+django-tastypie
+django_compressor
+cssmin
+jsmin
+-e git://github.com/hcarvalhoalves/django-taggit.git@e0f9642d7b94c8e6c0feb520d96bb6ae4d78a4d0#egg=django-taggit