Description of problem:
Given a ruby app (either ruby-1.8 or ruby-1.9), the presence of force_clear_build marker won't force a clean build, i.e., gems won't be reinstalled.

Version-Release number of selected component (if applicable):
INT(devenv_3957)

How reproducible:
always

Steps to Reproduce:
1. create a ruby app (ruby-1.8 or ruby-1.9)
2. install a ref gem with the following Gemfile and Gemfile.lock
<----Gemfile---->

source 'http://rubygems.org'

gem 'ref'
gem 'rack'
gem 'thread-dump'

<--------------->

<----Gemfile.lock---->

GEM
  remote: http://rubygems.org/
  specs:
    rack (1.5.2)
    ref (1.0.5)
    thread-dump (0.0.5)

PLATFORMS
  ruby

DEPENDENCIES
  rack
  ref
  thread-dump


<-------------------->

3. trigger a build

4. create a force_clean_build marker

5. trigger another build

Actual results:
In step 3, the ref gem was installed:

remote: Installing rack (1.5.2)
remote: Installing ref (1.0.5)
remote: Installing thread-dump (0.0.5) with native extensions
remote: Using bundler (1.0.21) 

However, after creating a force_clean_build marker, the ref gem was not reinstalled:

remote: Stopping Ruby cartridge
remote: Waiting for stop to finish
remote: Saving away previously bundled RubyGems
remote: Force clean build enabled - cleaning dependencies
remote: Building git ref 'master', commit 5e38761
remote: Building Ruby cartridge
remote: Restoring previously bundled RubyGems (note: you can commit .openshift/markers/force_clean_build at the root of your repo to force a clean bundle)
remote: Bundling RubyGems based on Gemfile/Gemfile.lock to repo/vendor/bundle with 'bundle install --deployment'
remote: Using rack (1.5.2)
remote: Using ref (1.0.5)
remote: Using thread-dump (0.0.5)
remote: Using bundler (1.0.21) ) 


Expected results:
Gems should be reinstalled with the presence of force_clean_build.

Additional info: