Merge branch 'events' into 'master'

Add generic api resource class

See merge request amiv-website!18

src/models/resource.js

+// Generic API resource
+import { apiUrl } from './config';
+import { getToken, logout } from './auth';
+
+const m = require('mithril');
+
+export default class Resource {
+  constructor(name, query = {}) {
+    this.name = name;
+    this.list = [];
+    this.query = query;
+  }
+
+  load() {
+    // Parse query such that the backend understands it
+    const parsedQuery = {};
+    Object.keys(this.query).forEach((key) => {
+      parsedQuery[key] = JSON.stringify(this.query[key]);
+    });
+    const queryString = m.buildQueryString(parsedQuery);
+
+    return m.request({
+      method: 'GET',
+      url: `${apiUrl}/${this.resource}/?${queryString}`,
+      headers: { Authorization: `Token ${getToken()}` },
+    }).catch((err) => {
+      // If the error is 401, the token is invalid -> auto log out
+      if (err._error.code === 401) { logout(); }
+
+      // Actual error information is in the '_error' field, pass this on
+      throw err._error;
+    });
+  }
+}