ui: adding backgrounds

- adds backgrounds to wizard dialog, welcome page, outbound/invite
pages.

Change-Id: Id76ee5f67f80513d39c51327f4d42bf4129edb8f
Tuleap: #148

ressources.qrc

@@ -30,5 +30,7 @@
         <file>images/icons/ic_settings_white_48dp_2x.png</file>
         <file>images/icons/ic_voicemail_white_24dp_2x.png</file>
         <file>images/icons/ic_share_white_24dp_2x.png</file>
+        <file>images/background-light.png</file>
+        <file>images/background-dark.png</file>
     </qresource>
 </RCC>

stylesheet.css

@@ -28,6 +28,9 @@ QPushButton#refuseButton:pressed, QPushButton#cancelButton:pressed{
 
 QWidget#callInvitePage, QWidget#outboundCallPage{
     background-color : rgb(77, 77, 77);
+    background-image : url(:/images/background-dark.png);
+    background-repeat : repeat-x;
+    background-position: bottom;
 }
 
 IdLabel{
@@ -225,7 +228,14 @@ QScrollBar::handle:vertical{
     background: rgb(77, 77, 77);
 }
 
-QWidget#welcomePage, QWidget#messagingPage{
+QDialog#WizardDialog, QWidget#welcomePage{
+    background: rgb(242, 242, 242);
+    background-image : url(:/images/background-light.png);
+    background-repeat : repeat-x;
+    background-position: bottom;
+}
+
+QWidget#messagingPage{
     background: rgb(242, 242, 242);
 }