Merge branch 'feature/tab-bar-item-props' into version-2.3

* feature/tab-bar-item-props:
  Add totally awesome spec which verifies that the image inset feature works
  Add image inset support for tab bar item

app/test_screens/tab_screen.rb

@@ -1,4 +1,4 @@
 class TabScreen < PM::Screen
   title "Tab"
-  tab_bar_item title: "Tab Item", item: "list"
+  tab_bar_item title: "Tab Item", item: "list", image_insets: [5,5,5,5]
 end

lib/ProMotion/tabs/tabs.rb

@@ -67,6 +67,7 @@ def create_tab_bar_item(tab={})
       tab_bar_item = create_tab_bar_item_custom(title, tab[:item], current_tag) if tab[:item]
 
       tab_bar_item.badgeValue = tab[:badge_number].to_s unless tab[:badge_number].nil? || tab[:badge_number] <= 0
+      tab_bar_item.imageInsets = tab[:image_insets] if tab[:image_insets]
 
       tab_bar_item
     end

spec/unit/tab_spec.rb

@@ -25,6 +25,10 @@
     @tab_bar.tabBar.items.first.title.should == "Tab Item"
   end
 
+  it "should allow setting image insets" do
+    @tab_bar.tabBar.items.first.imageInsets.should == UIEdgeInsetsMake(5,5,5,5)
+  end
+
   it "should have set the others to their respective titles" do
     @tab_bar.tabBar.items[1].title.should == "Basic"
     @tab_bar.tabBar.items[2].title.should == "Home"