improved quickstart:

* respective default answers will be written to config if user provided
   no answer
 * added tests for quickstart

tests/test_quickstart.py

@@ -0,0 +1,24 @@
+from blag.quickstart import get_input, quickstart
+
+
+def test_get_input_default_answer(monkeypatch):
+    monkeypatch.setattr('builtins.input', lambda x: '')
+    answer = get_input("foo", "bar")
+    assert answer == 'bar'
+
+
+def test_get_input(monkeypatch):
+    monkeypatch.setattr('builtins.input', lambda x: 'baz')
+    answer = get_input("foo", "bar")
+    assert answer == 'baz'
+
+
+def test_quickstart(cleandir, monkeypatch):
+    monkeypatch.setattr('builtins.input', lambda x: 'foo')
+    quickstart(None)
+    with open('config.ini', 'r') as fh:
+        data = fh.read()
+    assert 'base_url = foo' in data
+    assert 'title = foo' in data
+    assert 'description = foo' in data
+    assert 'author = foo' in data