[Review] Request from 'jordimassaguerpla' @ 'SUSE/hackweek/review_140422_preprend_bundle_exec'

Please review the following changes:
  * 14fcd20 preprend bundle exec to rake commands
  * 56da8a0 Use bundle exec in deploy.rb
  * fd89764 Disable ssl on rubygems until the SLE bug is fixed
  * a659e5c Merge pull request #66 from SUSE/review_140411_update_rails_i18n_nokogiri
  * 2597a76 fix sunspot:solr: constraint version and fix travis configuration
  * 5251ef6 update rails and its dependencies including i18n and nokogiri