Do the other static checks, but not clonedigger

.travis.yml

@@ -5,6 +5,7 @@ python:
 install:
 - pip install -r test_requirements.txt
 - pip install coveralls
+before_script: ./check.sh
 script: coverage run --source=pylast ./test_pylast.py
 after_success:
   coveralls

check.sh

@@ -5,7 +5,7 @@ echo ---
 pep8 test_pylast.py
 echo ---
 pep8 pylast.py
-echo ---
+# echo ---
-clonedigger --cpd-output pylast.py
+# clonedigger --cpd-output pylast.py
-grep "Clones detected" output.html
+# grep "Clones detected" output.html
-grep "lines are duplicates" output.html
+# grep "lines are duplicates" output.html