Update to Spring Boot 1.5.8 and Spring Cloud Dalston SR4

closes codecentric#591

Author: joshiste

pom.xml

@@ -5,7 +5,7 @@
     <parent>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-parent</artifactId>
-        <version>1.5.6.RELEASE</version>
+        <version>1.5.8.RELEASE</version>
         <relativePath/>
     </parent>
     <groupId>de.codecentric</groupId>
@@ -18,8 +18,8 @@
     <properties>
         <java.version>1.7</java.version>
         <main.basedir>${basedir}</main.basedir>
-        <spring-boot.version>1.5.6.RELEASE</spring-boot.version>
-        <spring-cloud.version>Dalston.SR3</spring-cloud.version>
+        <spring-boot.version>1.5.8.RELEASE</spring-boot.version>
+        <spring-cloud.version>Dalston.SR4</spring-cloud.version>
         <hystrix-dashboard.version>1.5.5</hystrix-dashboard.version>
         <build-plugin.jacoco.version>0.7.9</build-plugin.jacoco.version>
         <build-plugin.coveralls.version>4.3.0</build-plugin.coveralls.version>