Extract requests of current assignee

[emiliakaf]

User story

1. As a user
2. I want to see requests that are assigned to me in a roadmap
3. So that I can get an overview of my time availability.

Acceptance criteria

• [x] A method for the extraction of the request of the current assignee should be implemented. For the beginning, those requets don't have to be shown in te calender, only as an list for example.

Definition of done

• Can be demoed
• Fully tested with the unit test
• Code well structured and formatted (hold to code conventions)
• Clear explaination of code
• No syntax/runtime errors
• Codes are peerly reviewed
• Communicate issues by leaving comments on github

[woxihyc]

Maven dependency problem: "ofbiz" was introduced in the cookbook to extract data from the embedded database, the related maven dependency, that required in IDEA, was not introduced. Build Failure when adding maven dependencies myself.