Update widget colours / assets according to spec

* Modified font colours for read/un-read emails
* Add chip colours when viewing mail from multiple accounts
* Add calendar icon if message has an invite attachment
* Update background of read/un-read emails

bug 3351761

Change-Id: Id59573d25a6988e9e869335f95778aad28b43912
diff --git a/res/drawable/widget_conversation_selector.xml b/res/drawable/widget_conversation_selector.xml
deleted file mode 100644
index 9376172..0000000
--- a/res/drawable/widget_conversation_selector.xml
+++ /dev/null
@@ -1,10 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!-- Copyright (c) 2010, Google Inc. -->
-
-<selector xmlns:android="http://schemas.android.com/apk/res/android">
-    <item android:state_focused="true"
-          android:drawable="@drawable/header_row_focused_email_widget_holo" />
-    <item android:state_pressed="true"
-          android:drawable="@drawable/header_row_press_email_widget_holo" />
-    <item android:drawable="@drawable/bg_row_email_widget_holo" />
-</selector>