Miscelaneous improvements to the integration interface on BillyPortugal

Merge branch 'course' of caixote.premium-minds.local:leya/leela-server into course

Conflicts:
	leela/src/main/java/com/leya/leela/persistence/jpa/entities/course/JPACourseNode.java
	leela/src/main/java/com/leya/leela/restful/v1/conversion/CourseNodeConverter.java
Review for integration with apps
Merge branch 'app_review' into develop