added bootstrap webjar

src/main/java/com/commafeed/frontend/resources/CustomCssUrlRewritingProcessor.java

@@ -0,0 +1,18 @@
+package com.commafeed.frontend.resources;
+
+import ro.isdc.wro.model.resource.processor.impl.css.CssUrlRewritingProcessor;
+
+public class CustomCssUrlRewritingProcessor extends CssUrlRewritingProcessor {
+
+	/**
+	 * ignore webjar image replacements since they won't be available at runtime anyway
+	 */
+	@Override
+	protected String replaceImageUrl(String cssUri, String imageUrl) {
+		if (cssUri.startsWith("webjar:")) {
+			return imageUrl;
+		}
+		return super.replaceImageUrl(cssUri, imageUrl);
+	}
+
+}

src/main/java/com/commafeed/frontend/resources/WroAdditionalProvider.java

@@ -20,6 +20,7 @@ public class WroAdditionalProvider implements ProcessorProvider {
 		map.put("sassOnlyProcessor", new SassOnlyProcessor());
 		map.put("sassImport", new SassImportProcessor());
 		map.put("timestamp", new TimestampProcessor());
+		map.put("cssUrlRewriting", new CustomCssUrlRewritingProcessor());
 		return map;
 	}
 

src/main/java/com/commafeed/frontend/resources/WroManagerFactory.java

@@ -16,6 +16,7 @@ public class WroManagerFactory extends ConfigurableWroManagerFactory {
 		map.put("sassOnlyProcessor", new SassOnlyProcessor());
 		map.put("sassImport", new SassImportProcessor());
 		map.put("timestamp", new TimestampProcessor());
+		map.put("cssUrlRewriting", new CustomCssUrlRewritingProcessor());
 	}
 
 }