Added API getUserByName()

Tests and doc included

app/Api/User.php

@@ -21,6 +21,11 @@ class User extends \Kanboard\Core\Base
         return $this->user->getById($user_id);
     }
 
+    public function getUserByName($username)
+    {
+        return $this->user->getByUsername($username);
+    }
+
     public function getAllUsers()
     {
         return $this->user->getAll();

doc/api-user-procedures.markdown

@@ -113,6 +113,48 @@ Response example:
 }
 ```
 
+## getUserByName
+
+- Purpose: **Get user information**
+- Parameters:
+    - **username** (string, required)
+- Result on success: **user properties**
+- Result on failure: **null**
+
+Request example:
+
+```json
+{
+    "jsonrpc": "2.0",
+    "method": "getUserByName",
+    "id": 1769674782,
+    "params": {
+        "username": "biloute"
+    }
+}
+```
+
+Response example:
+
+```json
+{
+    "jsonrpc": "2.0",
+    "id": 1769674782,
+    "result": {
+        "id": "1",
+        "username": "biloute",
+        "password": "$2y$10$dRs6pPoBu935RpmsrhmbjevJH5MgZ7Kr9QrnVINwwyZ3.MOwqg.0m",
+        "role": "app-user",
+        "is_ldap_user": "0",
+        "name": "",
+        "email": "",
+        "google_id": null,
+        "github_id": null,
+        "notifications_enabled": "0"
+    }
+}
+```
+
 ## getAllUsers
 
 - Purpose: **Get all available users**

tests/integration/ApiTest.php

@@ -563,6 +563,20 @@ class Api extends PHPUnit_Framework_TestCase
         $this->assertNull($this->client->getUser(2222));
     }
 
+    public function testGetUserByName()
+    {
+        $user = $this->client->getUserByName('toto');
+        $this->assertNotFalse($user);
+        $this->assertTrue(is_array($user));
+        $this->assertEquals(2, $user['id']);
+
+        $user = $this->client->getUserByName('manager');
+        $this->assertNotEmpty($user);
+        $this->assertEquals('app-manager', $user['role']);
+
+        $this->assertNull($this->client->getUserByName('nonexistantusername'));
+    }
+
     public function testUpdateUser()
     {
         $user = array();