Upgrade build tools (Tycho, CBI) to latest version

Use latest Tycho version 1.6.0
https://wiki.eclipse.org/Tycho/Release_Notes/1.6

Use latest CBI jarsigner plugin
https://www.eclipse.org/cbi/sitedocs/eclipse-jarsigner-plugin/plugin-info.html

Change-Id: Ida485909d81744102eafed25a430172a15898e19
Signed-off-by: Markus Knauer <mknauer@eclipsesource.com>

releng/org.eclipse.rap.tools.build/pom.xml

diff --git a/releng/org.eclipse.rap.tools.build/pom.xml b/releng/org.eclipse.rap.tools.build/pom.xml
index bc0eb70..13b3a67 100644
--- a/releng/org.eclipse.rap.tools.build/pom.xml
+++ b/releng/org.eclipse.rap.tools.build/pom.xml
@@ -22,9 +22,8 @@
   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <maven.build.timestamp.format>yyyyMMdd-HHmm</maven.build.timestamp.format>
-    <tycho-version>1.0.0</tycho-version>
-    <tycho-extras-version>${tycho-version}</tycho-extras-version>
-    <signing-plugin-version>1.1.4</signing-plugin-version>
+    <tycho-version>1.6.0</tycho-version>
+    <signing-plugin-version>1.1.5</signing-plugin-version>
     <tycho.scmUrl>scm:git:git://git.eclipse.org/gitroot/rap/org.eclipse.rap.tools.git</tycho.scmUrl>
     <!-- disabled due to bug 393977
     <baseline-repository>http://download.eclipse.org/rt/rap/nightly/tooling/</baseline-repository>
@@ -57,12 +56,12 @@
           <dependency>
             <groupId>org.eclipse.tycho.extras</groupId>
             <artifactId>tycho-buildtimestamp-jgit</artifactId>
-            <version>${tycho-extras-version}</version>
+            <version>${tycho-version}</version>
           </dependency>
           <dependency>
             <groupId>org.eclipse.tycho.extras</groupId>
             <artifactId>tycho-sourceref-jgit</artifactId>
-            <version>${tycho-extras-version}</version>
+            <version>${tycho-version}</version>
           </dependency>
         </dependencies>
         <configuration>
@@ -208,7 +207,7 @@
           <plugin>
             <groupId>org.eclipse.tycho.extras</groupId>
             <artifactId>tycho-pack200a-plugin</artifactId>
-            <version>${tycho-extras-version}</version>
+            <version>${tycho-version}</version>
             <executions>
               <execution>
                 <id>pack200-normalize</id>
@@ -236,7 +235,7 @@
           <plugin>
             <groupId>org.eclipse.tycho.extras</groupId>
             <artifactId>tycho-pack200b-plugin</artifactId>
-            <version>${tycho-extras-version}</version>
+            <version>${tycho-version}</version>
             <executions>
               <execution>
                 <id>pack200-pack</id>