Merge pull request #2 from abargnesi/mongo_version_spec

exclude 2.x versions of the mongo gem dependency

Author: gkellogg

.gemspec

@@ -30,7 +30,7 @@ Gem::Specification.new do |gem|
   gem.required_ruby_version      = '>= 1.9.2'
   gem.requirements               = []
   gem.add_runtime_dependency     'rdf',         '>= 1.1'
-  gem.add_runtime_dependency     'mongo',       '>= 1.8.6'
+  gem.add_runtime_dependency     'mongo',       '>= 1.8.6',    '< 2.0'
 
   gem.add_development_dependency 'rdf-spec',    '>= 1.1'
   gem.add_development_dependency 'rspec',       '>= 2.14.0'