Add Java7 support

Author: Eric Dallo and Gabriel Lima Gomes

.travis.yml

@@ -1,6 +1 @@
-language: java
-sudo: false
-addons:
-  apt:
-    packages:
-      - oracle-java8-installer
+language: java

src/main/java/com/spring/loader/S3PropertyPlaceholderConfigurer.java

@@ -1,7 +1,6 @@
 package com.spring.loader;
 
 import static java.util.Arrays.asList;
-import static java.util.stream.Collectors.toList;
 
 import java.util.ArrayList;
 import java.util.List;
@@ -42,11 +41,12 @@ public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory)
 		int total = conventionalResources.size() + s3Locations.size();
 
 		if (total > 0) {
-			List<Resource> allResources = s3Locations.stream()
-					.map(resourceLoader::getResource)
-					.collect(toList());
+			List<Resource> allResources = new ArrayList<>();
+			for (String location : s3Locations) {
+				allResources.add(resourceLoader.getResource(location));
+			}
 
-			conventionalResources.forEach(allResources::add);
+			allResources.addAll(conventionalResources);
 
 			super.setLocations(allResources.toArray(new Resource[allResources.size()]));
 		}