Change format of stored message

[ronjarehm]

User Story

1. As a User,
2. I want the messages to be stored in an ideal way,
3. so that I have a robust and efficient system

Acceptance Criteria

• store messages in something like JSON, CSV... instead of
  <sequence_number>
  <message_string>

Definition of Done

Feature Code Review has been completed and passed
a) Code is completly implemented
b) Code is structured according to our coding guidelines and commented
c) Code is checked into repository
d) Documentation is updated
Cleanliness of Code
JUnit Tests have been written and passed (if required)
No critical bugs are open
Feature branch has been tagged and merged
Feature Code has been included into the release (candidate)
Product Owners accept Feature