rewrite rakefile

add clause to check reuby version as < 1.9.3 is no longer supported by Rubocop

Rakefile

@@ -1,13 +1,20 @@
 require 'rspec/core/rake_task'
 require 'rubocop/rake_task'
 
-RSpec::Core::RakeTask.new(:spec) do |r|
-  r.pattern = FileList['**/**/*_spec.rb']
+desc 'Don\'t run Rubocop for unsupported versions'
+begin
+  if RUBY_VERSION >= '1.9.3'
+    args = [:spec, :rubocop]
+  else
+    args = [:spec]
+  end
 end
 
 Rubocop::RakeTask.new
 
-task default: [:spec, :rubocop]
+RSpec::Core::RakeTask.new(:spec) do |r|
+  r.pattern = FileList['**/**/*_spec.rb']
+end
 
 desc 'Calculate technical debt'
 task :calculate_debt do
@@ -18,3 +25,5 @@ desc 'Make all plugins executable'
 task :make_plugins_executable do
   `chmod -R +x /plugins/*`
 end
+
+task default: args

Vagrantfile

@@ -21,11 +21,13 @@ curl -L get.rvm.io | bash -s stable
 source /home/vagrant/.rvm/scripts/rvm
 rvm reload
 #rvm install 1.8.7
-#rvm install 1.9.3
+rvm install 1.9.2
+rvm install 1.9.3
 rvm install 2.1.4
 rvm install 2.0.0
 #rvm use 1.8.7@sensu_plugins --create
-#rvm use 1.9.3@sensu_plugins --create
+rvm use 1.9.3@sensu_plugins --create
+rvm use 1.9.2@sensu_plugins --create
 rvm use 2.0.0@sensu_plugins --create
 rvm use 2.1.4@sensu_plugins --create
 rvm use 2.1.4@sensu_plugins --default