SQL optimization, avoid query in pre_save_polymorphic()

This query is visible in the django-debug-toolbar POST redirect page
Small admin documentation fix.
Include templates in install.
remove trailing '/'
Merge pull request #14 from thenewguy/master

remove trailing slash
Merge branch 'install-admin-templates' of https://github.com/onepercentclub/django_polymorphic into onepercentclub-install-admin-templates

Conflicts:
	MANIFEST.in
Merge pull request #12 from vdboor/master

Avoid SQL query in pre_save_polymorphic()
Bumped setup.py version, Changes, for 0.3 release
Merge branch 'master' of github.com:chrisglass/django_polymorphic
Point release fixes a merge error.