switch all maven repository URLs to HTTPS

Author: stefanseifert

.travis.maven-settings.xml

@@ -31,7 +31,7 @@
 
         <repository>
           <id>central</id>
-          <url>http://repo1.maven.org/maven2/</url>
+          <url>https://repo1.maven.org/maven2/</url>
           <layout>default</layout>
           <releases>
             <enabled>true</enabled>
@@ -70,7 +70,7 @@
 
         <repository>
           <id>apache-snapshots</id>
-          <url>http://repository.apache.org/snapshots</url>
+          <url>https://repository.apache.org/snapshots</url>
           <layout>default</layout>
           <releases>
             <enabled>false</enabled>
@@ -87,7 +87,7 @@
 
         <pluginRepository>
           <id>central</id>
-          <url>http://repo1.maven.org/maven2/</url>
+          <url>https://repo1.maven.org/maven2/</url>
           <layout>default</layout>
           <releases>
             <enabled>true</enabled>
@@ -126,7 +126,7 @@
 
         <pluginRepository>
           <id>apache-snapshots</id>
-          <url>http://repository.apache.org/snapshots</url>
+          <url>https://repository.apache.org/snapshots</url>
           <layout>default</layout>
           <releases>
             <enabled>false</enabled>

public_site/src/site/markdown/maven.md

@@ -20,7 +20,7 @@ Sometimes snapshot are referenced from the Apache Snapshot repository:
 ```xml
 <repository>
   <id>apache-snapshots</id>
-  <url>http://repository.apache.org/snapshots</url>
+  <url>https://repository.apache.org/snapshots</url>
   <layout>default</layout>
   <releases>
     <enabled>false</enabled>