Description of problem:
Given a ruby-1.8 cartridge app, install gem package by Gemfile, after git push,the app will cannot be accessible.

Version-Release number of selected component (if applicable):
devenv_4874

How reproducible:
always

Steps to Reproduce:
1. Create one ruby-1.8 app
2. Add 'Gemfile' in the repo with following content:
   
   source 'https://rubygems.org'

   gem 'sinatra'

3. bundle install
4. git push

Actual results:
after step 4: 
for non-scale ruby-1.8, when accessing show "Ruby (Rack) application could not be started"
for scale ruby-1.8, app will cannot be accessible: 503 error

Expected results:
app can work well

Additional info:
ruby-1.9 can work well.
and check the log:
rhc tail crb18s
==> app-root/logs/haproxy_ctld.log <==
I, [2014-06-17T08:07:48.764395 #31496]  INFO -- : Starting haproxy_ctld
I, [2014-06-17T08:50:13.606026 #13074]  INFO -- : Starting haproxy_ctld

==> app-root/logs/haproxy.log <==
[ALERT] 167/081210 (31928) : proxy 'express' has no server available!
[WARNING] 167/085012 (31928) : Server express/local-gear is DOWN for maintenance.
[WARNING] 167/085013 (13053) : config : log format ignored for proxy 'stats' since it has no log address.
[WARNING] 167/085013 (13053) : config : log format ignored for proxy 'express' since it has no log address.
[WARNING] 167/085013 (13053) : Server express/local-gear is DOWN, reason: Layer7 wrong status, code: 500, info: "Internal Server Error", check duration: 354ms. 0 active and 0 backup servers left. 0 sessions active, 0 requeued, 0 remaining in queue.
[ALERT] 167/085013 (13053) : proxy 'express' has no server available!
[WARNING] 167/085014 (13053) : Server express/local-gear is DOWN for maintenance.
[WARNING] 167/085015 (13053) : Server express/local-gear is UP (leaving maintenance).
[WARNING] 167/085015 (13053) : Server express/local-gear is DOWN, reason: Layer7 wrong status, code: 500, info: "Internal Server Error", check duration: 191ms. 0 active and 0 backup servers left. 0 sessions active, 0 requeued, 0 remaining in queue.
[ALERT] 167/085015 (13053) : proxy 'express' has no server available!

==> app-root/logs/ruby.log <==
	from config.ru:1
- - - [17/Jun/2014:09:08:36 -0400] "GET / HTTP/1.0" 500 5066 "-" "-"
*** Exception LoadError in Class (no such file to load -- thread-dump) (process 13200, thread #<Thread:0x7f44745ed368>):
	from config.ru:2:in `require'
	from config.ru:2
	from /var/lib/openshift/53a02f76b918773b65000ddb/app-root/runtime/repo/vendor/bundle/ruby/1.8/gems/rack-1.5.2/lib/rack/builder.rb:55:in `instance_eval'
	from /var/lib/openshift/53a02f76b918773b65000ddb/app-root/runtime/repo/vendor/bundle/ruby/1.8/gems/rack-1.5.2/lib/rack/builder.rb:55:in `initialize'
	from config.ru:1:in `new'
	from config.ru:1