Announce RVM version with Ruby and Gem version

Close #84

examples/build_go.sh

@@ -103,7 +103,7 @@ travis_finish before_install $?
 
 travis_start install
 if [[ -f Makefile ]]; then
-  echo \$\ true \#\ \(using\ Makefile\)
+  echo \$\ true
   true
   travis_assert
 else

examples/build_ruby.sh

@@ -98,6 +98,8 @@ echo \$\ ruby\ --version
 ruby --version
 echo \$\ gem\ --version
 gem --version
+echo \$\ rvm\ --version
+rvm --version
 travis_finish announce $?
 
 travis_start before_install

examples/build_ruby_jruby.sh

@@ -106,6 +106,8 @@ echo \$\ ruby\ --version
 ruby --version
 echo \$\ gem\ --version
 gem --version
+echo \$\ rvm\ --version
+rvm --version
 travis_finish announce $?
 
 travis_start before_install

lib/travis/build/script/ruby.rb

@@ -25,6 +25,7 @@ def announce
           super
           cmd 'ruby --version'
           cmd 'gem --version'
+          cmd 'rvm --version'
         end
 
         def install
@@ -66,7 +67,7 @@ def uses_java?
           def uses_jdk?
             uses_java? && super
           end
-          
+
           def ruby_version
             ruby_version = config[:rvm].to_s.gsub(/-(1[89]|20)mode$/, '-d\1')
             ruby_version.gsub(/^rbx-d(\d{2})$/, 'rbx-weekly-d\1')

spec/script/ruby_spec.rb

@@ -39,6 +39,10 @@
     should announce 'ruby --version'
   end
 
+  it 'announces rvm --version' do
+    should announce 'rvm --version'
+  end
+
   it 'installs with bundle install with the given bundler_args if the gemfile exists' do
     gemfile 'Gemfile.ci'
     should install 'bundle install'