Add local copies of hystrix images

Fixes gh-1076

spring-cloud-netflix-hystrix-dashboard/src/main/resources/static/hystrix/css/global.css

@@ -14,7 +14,7 @@ img {
 
 
 #header {
-	background: #FFFFFF url(http://raw.github.com/wiki/Netflix/Hystrix/images/hystrix-logo-tagline-tiny.png) no-repeat scroll 99% 0%;
+	background: #FFFFFF url(../images/hystrix-logo-tagline-tiny.png) no-repeat scroll 99% 0%;
 	height: 65px;
 	margin-bottom: 5px;
 }
@@ -65,7 +65,7 @@ img {
 	}
 	
 	#header {
-		background: #FFFFFF url(http://raw.github.com/wiki/Netflix/Hystrix/images/hystrix-logo-tagline-tiny.png) no-repeat scroll 99% 50%;
+		background: #FFFFFF url(../images/hystrix-logo-tagline-tiny.png) no-repeat scroll 99% 50%;
 		height: 65px;
 	}
 }

spring-cloud-netflix-hystrix-dashboard/src/main/resources/templates/hystrix/index.ftl

@@ -31,7 +31,7 @@
 <div style="width:800px;margin:0 auto;">
 	
 	<center>
-	<img width="264" height="233" src="https://raw.github.com/wiki/Netflix/Hystrix/images/hystrix-logo.png">
+	<img width="264" height="233" src="<@spring.url '/hystrix'/>/images/hystrix-logo.png">
 	<br>
 	<br>