Attempt to install codecov (#543)

* Attempt to install codecov

* Create .codecov.yml

* Update .travis.yml

* Add simplecov

* Add docker volume and change formatter

* Remove unneccessary files and fix rubocop issues

* Remove coveralls and add more filters

* modify gitignore

* add .simplecov file

* remove docker volume

.codecov.yml

@@ -0,0 +1,11 @@
+comment:
+  layout: "reach, diff, flags, files"
+  behavior: default
+  require_changes: false  # if true: only post the comment if coverage changes
+  require_base: no        # [yes :: must have a base report to post]
+  require_head: yes       # [yes :: must have a head report to post]
+  branches: null          # branch names that can post comment
+coverage:
+  status:
+    project: off
+    patch: off