WIP: [DONT MERGE] Frontend development

For frontend development, some changes have to be made:

• In frontend/src/store/modules/user.js change the line [types.USER_LOAD_ME]: context => http.get('me') to [types.USER_LOAD_ME]: context => http.get('user/<netid>') where <netid> is the netid of the user you want to load from your database
• Because no valid SAML is present, you are making cross-origin requests. To allow these requests, add the annotation @CrossOrigin(origins = "http://localhost:3000") at every place the annotation @RestController is used

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