Add documentation for external starter projects.

docs/starterprojects.txt

@@ -156,3 +156,14 @@ the Django templating language. It uses ``pinax.views.static_view`` mounted
 at ``/``. For example if you access ``/test.html`` it will render
 ``templates/test.html``. Directory paths, i.e., ``/a/``, will render
 ``/templates/a/index.html``.
+
+External Starter Projects
+=========================
+
+The Pinax ``setup_project`` command can also use starter projects built by third parties. 
+These can either be plain directory structures, or they may be a git/hg pip editable.
+
+To install a starter project from an external source, simply pass the file path or git/hg 
+URL to the ``-b`` option::
+
+    pinax-admin setup_project -b git+git://github.com/user/project.git#egg=project my_new_project

pinax/core/management/commands/setup_project.py

@@ -37,12 +37,12 @@ class Command(BaseCommand):
         optparse.make_option("-l", "--list-bases",
             dest = "list_bases",
             action = "store_true",
-            help = "lists the starter projects (bases) that are available"
+            help = "lists the bundled starter projects (bases) that are available"
         ),
         optparse.make_option("-b", "--base",
             dest = "base",
             default = "zero",
-            help = "the starter project to use as a base (excluding _project, e.g., basic or social. see --list-projects)"
+            help = "the starter project to use as a base (excluding _project, e.g., basic or social. see --list-projects for included starter projects).  Valid git/hg PIP editable strings and plain file paths are accepted, as well."
         ),
         optparse.make_option("--no-reqs",
             dest = "no_reqs",