Add cli logout command

cli/actions.js

 'use strict';
 
 exports.login = login;
+exports.logout = logout;
 exports.put = put;
 exports.get = get;
 exports.del = del;
@@ -92,6 +93,23 @@ function login(uri) {
     });
 }
 
+function logout() {
+    checkConfig();
+
+    superagent.post(config.server() + '/api/logout').query(gQuery).end(function (error, result) {
+        if (result && result.statusCode !== 200) console.log('Failed to logout: ' + result.statusCode);
+        if (error) console.log(error);
+
+        // TODO remove at some point, this is just to clear the previous old version values
+        config.set('username', '');
+        config.set('password', '');
+        config.set('server', '');
+        config.set('accessToken', '');
+
+        console.log('Done'.green);
+    });
+}
+
 function put(filePath, otherFilePaths, options) {
     checkConfig();
 

cli/surfer.js

@@ -11,6 +11,10 @@ program.command('login <url>')
     .description('Login to server')
     .action(actions.login);
 
+program.command('logout')
+    .description('Logout from server')
+    .action(actions.logout);
+
 program.command('put <file> [files...]')
     .option('-a --all', 'Also include hidden files and folders.', false)
     .description('Put a file, last argument is destination if provided')