[Merb for Ruby19] gem version should not contain any spaces

Problem:
  "merb --version" doesn't work

Check:

(maiha-no-macbook-air)<~>% ruby19 -r rubygems -e "gem 'merb-core', '>= 0'"
<internal:gem_prelude>:249:in `push_gem_version_on_load_path': undefined method `<=>' for nil:NilClass (NoMethodError)
        from <internal:gem_prelude>:14:in `gem'
        from -e:1:in `<main>'
 
(maiha-no-macbook-air)<~>% ruby19 -r rubygems -e "gem 'merb-core', '>=0'"
/Users/maiha/ruby/lib/ruby19/1.9.1/rubygems.rb:636:in `report_activate_error': Could not find RubyGem merb-core (>= 0) (Gem::LoadError)
 
no spaces works sane although gems are not installed yet.

Conclusion:
  gem version should not contain any spaces

Patch: (bin/merb)
- version = ">= 0"
+ version = ">=0"