Update Travis: run unit tests, also build Sphinx

Author: kinow

.travis.yml

@@ -16,6 +16,8 @@ branches:
 before_script:
   - pip install -U pip setuptools wheel typing
   - pip install cwltool cwltest html5lib
+  - pip install -r requirements.txt
 
 script:
   - make RUNNER=cwltool unittest-examples
+  - make html

Makefile

@@ -24,7 +24,18 @@ watch:
 	@echo "Building and watching for changes in the documentation."
 	sphinx-autobuild --ignore venv . _build/html
 
+## unittest         : run unit tests on checking tools.
+unittest :
+	@bin/test_lesson_check.py
+
+#-------------------------------------------------------------------------------
+# Include extra commands if available.
+#-------------------------------------------------------------------------------
+
+-include commands.mk
+
 # Catch-all target: route all unknown targets to Sphinx using the new
 # "make mode" option.  $(O) is meant as a shortcut for $(SPHINXOPTS).
 %: Makefile
 	@$(SPHINXBUILD) -M $@ "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)
+