split up flake jobs

* split flake8 jobs into two seperate jobs to better control the result
+ add allow_failure: true to the pep8 job to not discourage anybody from commiting code

.gitlab-ci.yml

@@ -7,12 +7,18 @@ before_script:
   - pip install flake8
 
 stages:
-  - check
+  - syntax
+  - pep8
 
-flake8:
-  stage: check
+syntax:
+  stage: syntax
   script:
-    # breaking errors and syntax errors
+    # breaking errors ie syntax errors
     - flake8 --select=E9,F63,F7,F82 --show-source
-    # pep8 warnings
+
+pep8:
+  stage: pep8
+  script:
+      # pep8 warnings
     - flake8 --max-complexity=10 --max-line-length=120 --show-source
+  allow_failure: true