Add output from the example basic.py to the documentation.

Author: RKrahl

doc/examples/basic.out

@@ -0,0 +1,15 @@
+$ py.test -rsx basic.py
+============================= test session starts ==============================
+platform linux -- Python 3.4.6, pytest-2.8.7, py-1.4.30, pluggy-0.3.1
+rootdir: /home/user/pytest-dependency-0.2, inifile: 
+plugins: dependency-0.2
+collected 5 items 
+
+basic.py x.s.s
+=========================== short test summary info ============================
+SKIP [1] /usr/lib/python3.4/site-packages/pytest_dependency.py:65: test_e depends on test_c
+SKIP [1] /usr/lib/python3.4/site-packages/pytest_dependency.py:65: test_c depends on test_a
+XFAIL basic.py::test_a
+  deliberate fail
+
+================ 2 passed, 2 skipped, 1 xfailed in 0.02 seconds ================

doc/src/usage.rst

@@ -13,9 +13,13 @@ Consider the following example test module:
 All the tests are decorated with :func:`pytest.mark.dependency`.  This
 will cause the test results to be registered internally and thus other
 tests may depend on them.  The list of dependencies of a test may be
-set in the optional `depends` argument to the marker.  The first test
-has deliberately been set to fail to illustrate the effect.  We will
-get the following resuts:
+set in the optional `depends` argument to the marker.  Running this
+test, we will get the following result:
+
+.. literalinclude:: ../examples/basic.out
+
+The first test has deliberately been set to fail to illustrate the
+effect.  We will get the following resuts:
 
 `test_a`
   deliberatly fails.