Implement Remove Branch function via REST

In order to start communicating with JCommune via REST service, we need to refactor existing code to use REST framework. We have Remove Branch (also component and section) function, so we have something to start from.
Acceptance Criteria:

• We're doing HTTP DELETE for [base_jcommune_url]/branch/ {branch_id}
• The communication between Poulpe and JC is done via REST (we can consider other REST framework than existing if we need, like Jersey)
• The communication is secured (HTTPS is used). We need to carry out some investigation, create keys and establish secured connection.

Note, that JC will be migrating to REST afterwards, thus you don't have the other side and should use SoapUI to test that.