- Introduced user registration

- Now using Spring Boot for classloading, this way local development does not need to restart the complete server
- Fixed all kinds of dependencies on the names of the lessons necessary to keep in mind during the creation of a lesson.
- Simplied loading of resources, by adding resource mappings in MvcConfig.
- Refactored plugin loading, now only one class is left for loading the lessons.

webgoat-lessons/command-injection/src/main/resources/lessonPlans/en/CommandInjection1.adoc

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+
+== HTTP Proxy Overview
+
+Many times proxies are used as a way of accessing otherwise blocked content.  A user might connect to server A, which relays content from server B
+ ... Because Server B is blocked within the user's network. That's not the use case we will be dealing with here, but the concept is the same.
+HTTP Proxies receive requests from a client and relay them. They also typically record them. They act as a man-in-the-middle (keep that in mind if you decide to
+use a proxy server to connect to some other system that is otherwise blocked). We won't get into HTTP vs HTTPS just yet, but that's an important topic in
+relationship to proxies.
+
+=== Proxy Capabilities
+
+Proxies sit between your client and the server the client is talking to. You can record and analyze the requests & responses.  You can also use the proxy to
+modify (tamper) the requests and responses.  Proxies also have automated or semi-automated functions that allow  you to gain efficiency in testing and
+analyzing the security of a website.
+
+=== Other Uses for Proxies
+
+ZAP specifically can also be used in the development process in a CI/CD, DevOps or otherwise automated build/test environment.  This lesson does
+not currently have any details on that, but it is worth mentioning. There are a number of examples on the internet of it being integrated into a
+CI/CD with Jenkins, Maven or other build processes.