Make the commit list more robust

Uses git rev-list instead of git cherry to list commits. This has the option to ignore known/non-new commits which should reduce the noise in the console. Additionally, updated to use better checks for skipping certain events (like deletion events) and rely on the write perms instead.

README.md

@@ -56,6 +56,6 @@ To enable the Git hook that makes use of this service, a running GitLab instance
 
 1. Access the GitLab server shell, and create a folder at `/opt/gitlab/embedded/service/gitlab-shell/hooks/pre-receive.d/` if it doesn't already exist. This folder will contain all of the servers global Git hooks for pre-receive events. These hooks trigger when a user attempts to push information to the server.  
 1. In the host machine, copy the ECA script to the newly created folder. If using a docker container, this can be done with a call similar to the following:  
-`docker cp src/main/rb/eca.rb gitlab.eca_web_1:/opt/gitlab/embedded/service/gitlab-shell/hooks/pre-receive.d/`
+`docker cp src/main/rb/eca.rb git-eca-rest-api-web-1:/opt/gitlab/embedded/service/gitlab-shell/hooks/pre-receive.d/`
 
 1. In the GitLab shell once again, ensure that the newly copied script matches the folders ownership, and that the file permissions are `755`. This allows the server to properly run the hook when needed.