Massive code refactoring, and some test rewrites.

app/tests/config_test.py

@@ -0,0 +1,16 @@
+import os
+
+from ..lib.config import Config
+
+
+class TestConfig:
+    config = Config(os.path.abspath(os.path.curdir))
+
+    def test_book_dir(self):
+        assert os.path.isdir(self.config.book_path)
+
+    def test_title(self):
+        assert 'pyShelf' in self.config.TITLE
+
+    def test_version(self):
+        assert self.config.VERSION is not None