Remove pylint from travis installation + added some doc + fixed notifications for travis

.travis.yml

@@ -1,25 +1,28 @@
+# Infection Monkey travis.yml. See Travis documentation for information about this file structure.
+
 group: travis_latest
 language: python
 cache: pip
 python:
 - 3.7
 install:
-- pip install -r monkey/monkey_island/requirements.txt
-- pip install flake8 pytest dlint pylint
-- pip install -r monkey/infection_monkey/requirements_linux.txt
+- pip install -r monkey/monkey_island/requirements.txt  # for unit tests
+- pip install flake8 pytest dlint  # for next stages
+- pip install -r monkey/infection_monkey/requirements_linux.txt  # for unit tests
 before_script:
-- flake8 . --count --select=E901,E999,F821,F822,F823 --show-source --statistics
-- flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
-- python monkey/monkey_island/cc/set_server_config.py testing
+- flake8 . --count --select=E901,E999,F821,F822,F823 --show-source --statistics  # Check syntax errors
+- flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics  # warn about linter issues. --exit-zero
+  # means this stage will not fail the build. This is (hopefully) a temporary measure until all warnings are suppressed.
+- python monkey/monkey_island/cc/set_server_config.py testing  # Set the server config to `testing`, for the UTs to use
+  # mongomaock and pass.
 script:
 - cd monkey  # This is our source dir
 - python -m pytest  # Have to use `python -m pytest` instead of `pytest` to add "{$builddir}/monkey/monkey" to sys.path.
 notifications:
-  slack:
+  slack:  # Notify to slack
       rooms:
-      - infectionmonkey:QaXbsx4g7tHFJW0lhtiBmoAg#ci
-      - infectionmonkey:QaXbsx4g7tHFJW0lhtiBmoAg#github
-      on_success: always
+      - infectionmonkey:QaXbsx4g7tHFJW0lhtiBmoAg#ci  # room: #ci
+      on_success: change
       on_failure: always
   email:
       on_success: change