title: warble, cannot load such file -- spec/rake/spectask error
body: <p>I'm very new to Ruby, Jruby and Rails etc. I'm trying to deploy a jruby application to tomcat server using warble. I'm on a windows machine, below is the error I get when I run <strong>warble</strong> from the project's root directory. I did google a lot for the issue, but either the solution didn't work or it wasn't detailed enough for a newbie to understand. Any help or advice is highly appreciated.</p>
  
  <pre><code>&gt; warble 
  
  Ruby/Ruby193/lib/ruby/1.9.1/rake/rdoctask.rb
  warble aborted!
  cannot load such file -- spec/rake/spectask
  </code></pre>
  
  <p>Following are the Ruby gems that are already installed. </p>
  
  <pre><code>gem list --local
  
  *** LOCAL GEMS ***
  
  actionmailer (2.3.5)
  actionpack (2.3.5)
  activerecord (2.3.5)
  activeresource (2.3.5)
  activesupport (2.3.5)
  bigdecimal (1.1.0)
  diff-lcs (1.1.3)
  hoe (3.3.0)
  i18n (0.4.0)
  io-console (0.3)
  jruby-jars (1.7.0)
  jruby-rack (1.1.10)
  json (1.5.4)
  minitest (2.5.1)
  rack (1.0.1)
  rails (2.3.5)
  rake (0.9.2.2)
  rdoc (3.9.4)
  rspec (2.12.0)
  rspec-core (2.12.0)
  rspec-expectations (2.12.0)
  rspec-mocks (2.12.0)
  rubyzip (0.9.9)
  test-unit (2.5.2, 1.2.3)
  warbler (1.3.6)
  
  
  jruby -S gem list --local
  
  *** LOCAL GEMS ***
  
  actionmailer (3.2.9)
  actionpack (3.2.9)
  activemodel (3.2.9)
  activerecord (3.2.9)
  activerecord-jdbc-adapter (1.2.2.1)
  activerecord-jdbcmysql-adapter (1.2.2.1)
  activeresource (3.2.9)
  activesupport (3.2.9)
  arel (3.0.2)
  builder (3.0.4)
  bundler (1.2.2)
  erubis (2.7.0)
  hike (1.2.1)
  i18n (0.6.1)
  jdbc-mysql (5.1.13)
  journey (1.0.4)
  jruby-win32ole (0.8.5)
  json (1.7.5 java)
  mail (2.4.4)
  mime-types (1.19)
  multi_json (1.3.7)
  polyglot (0.3.3)
  rack (1.4.1)
  rack-cache (1.2)
  rack-ssl (1.3.2)
  rack-test (0.6.2)
  rails (3.2.9)
  railties (3.2.9)
  rake (0.9.2.2)
  rdoc (3.12)
  sprockets (2.2.1)
  test-unit (2.5.2)
  thor (0.16.0)
  tilt (1.3.3)
  treetop (1.4.12)
  tzinfo (0.3.35)
  </code></pre>