Merge pull request #24 from jbaiter/holo-icons

Previously most of the icons looked a bit cobbled together and not very Android-y. This PR replaces them with semantically equivalent icons from Google's Iconography recommendations.
This aligns Android-Password-Store more with Google's design recommendations and other Android apps.

app/src/main/res/layout/child_row_layout.xml

@@ -10,7 +10,7 @@
             android:id="@+id/crypto_delete_button"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
-            android:src="@drawable/ico_del"
+            android:src="@drawable/ic_action_discard"
             android:background="@drawable/red_rectangle"
             android:layout_gravity="center_vertical"
             android:layout_column="1"
@@ -20,7 +20,7 @@
             android:id="@+id/crypto_show_button"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
-            android:src="@drawable/ico_key"
+            android:src="@drawable/ic_action_accounts"
             android:background="@drawable/blue_rectangle"
             android:layout_gravity="center_vertical"
             android:layout_marginLeft="8dp"

app/src/main/res/layout/encrypt_layout.xml

@@ -97,7 +97,7 @@
         <ImageButton
             android:layout_height="wrap_content"
             android:layout_width="wrap_content"
-            android:src="@drawable/ico_confirm_add"
+            android:src="@drawable/ic_action_save"
             android:background="@drawable/blue_rectangle"
             android:id="@+id/crypto_confirm_add"
             android:onClick="handleClick"
@@ -108,7 +108,7 @@
         <ImageButton
             android:layout_height="wrap_content"
             android:layout_width="wrap_content"
-            android:src="@drawable/ico_cancel"
+            android:src="@drawable/ic_action_cancel"
             android:background="@drawable/red_rectangle"
             android:id="@+id/crypto_cancel_add"
             android:onClick="handleClick"

app/src/main/res/layout/key_id.xml

@@ -34,7 +34,7 @@
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:layout_column="3"
-            android:src="@drawable/ico_key"
+            android:src="@drawable/ic_action_accounts"
             android:background="@android:color/transparent"
             android:onClick="handleClick"
             android:layout_gravity="center_vertical"/>

app/src/main/res/menu/context_pass.xml

@@ -4,7 +4,7 @@
     tools:context=".pwdstore">
 
     <item android:id="@+id/menu_delete_password"
-        android:icon="@drawable/ico_del"
+        android:icon="@drawable/ic_action_discard"
         app:showAsAction="always"
         android:title="Delete"/>
 </menu>

app/src/main/res/menu/pgp_handler.xml

@@ -3,7 +3,7 @@
     xmlns:pwstore="http://schemas.android.com/apk/res-auto"
     tools:context="com.zeapo.pwdstore.crypto.PgpHandler" >
     <item android:title="Copy password"
-        android:icon="@drawable/ico_copy"
+        android:icon="@drawable/ic_action_copy"
         pwstore:showAsAction="ifRoom"
         android:id="@+id/copy_password"
         />

app/src/main/res/menu/pwdstore.xml

@@ -10,7 +10,7 @@
           pwstore:actionViewClass="android.support.v7.widget.SearchView" />
 
     <item android:id="@+id/menu_add_password"
-        android:icon="@drawable/ico_add"
+        android:icon="@drawable/ic_action_new"
         pwstore:showAsAction="ifRoom"
         android:title="New password"/>
 
@@ -24,7 +24,7 @@
 
     <item android:id="@+id/refresh"
         android:title="Refresh list"
-        pwstore:showAsAction="never"
+        android:showAsAction="never"
         android:icon="@drawable/ico_sync"/>
 
     <item android:id="@+id/user_pref"