Add issue link to testcase.

Refactor variable name.

Author: robertpainsi

catroidUiTest/src/org/catrobat/catroid/uitest/ui/ScriptFragmentTest.java

@@ -162,7 +162,8 @@ public void testBrickCategoryDialog() {
 	}
 
 	/**
-	 * Tests issue#54.
+	 * 
+	 * Tests issue#54. https://github.com/Catrobat/Catroid/issues/54
 	 */
 	public void testOnlyAddControlBricks() {
 		initEmptyProject();
@@ -177,7 +178,7 @@ public void testOnlyAddControlBricks() {
 		solo.clickOnScreen(20, yPositionList.get(1));
 		solo.sleep(200);
 
-		assertEquals("Two controll bricks should be added.", 2, sprite.getNumberOfScripts());
+		assertEquals("Two control bricks should be added.", 2, sprite.getNumberOfScripts());
 		assertTrue("First script isn't a start script.", sprite.getScript(0) instanceof StartScript);
 		assertTrue("Second script isn't a broadcast script.", sprite.getScript(1) instanceof BroadcastScript);
 	}

catroidUiTest/src/org/catrobat/catroid/uitest/util/UiTestUtils.java

@@ -642,10 +642,10 @@ public static ArrayList<Integer> getListItemYPositions(final Solo solo) {
 	}
 
 	public static int getAddedListItemYPosition(Solo solo) {
-		ArrayList<Integer> yPositionList = getListItemYPositions(solo);
-		int pos = yPositionList.size() / 2;
+		ArrayList<Integer> yPositionsList = getListItemYPositions(solo);
+		int middleYPositionIndex = yPositionsList.size() / 2;
 
-		return yPositionList.get(pos);
+		return yPositionsList.get(middleYPositionIndex);
 	}
 
 	public static void longClickAndDrag(final Solo solo, final float xFrom, final float yFrom, final float xTo,