journal: render markdown content + title metadata

this has a really basic template and whatnot at the moment, so
styling/etc isn't done, but this is maybe the last major piece before I
could actually see pushing this onto the site

tests/instance/journal/index.md

@@ -1,3 +1,5 @@
+Title:      Index
+
 # test index
 
 this is some test content

tests/instance/journal/no-title.md

@@ -0,0 +1 @@
+# this page doesn't have a title!

tests/test_journal.py

@@ -17,8 +17,22 @@ def test_journal_file_resolver_other_requests_fine():
 def test_journal_file_that_exists(client):
     response = client.get('/')
     assert response.status_code == 200
+    assert b'<h1>test index</h1>' in response.data
 
 
 def test_journal_file_that_doesnt_exist(client):
     response = client.get('/ohuesthaoeusth')
     assert response.status_code == 404
+
+
+def test_journal_file_with_title_metadata(client):
+    response = client.get('/')
+    assert response.status_code == 200
+    assert b'<title>Index - incorporeal.org</title>' in response.data
+
+
+def test_journal_file_without_title_metadata(client):
+    response = client.get('/no-title')
+    assert response.status_code == 200
+    assert b'<title>incorporeal.org</title>' in response.data
+    assert b'<h1>this page doesn\'t have a title!</h1>' in response.data