Update demo package metadata

Also
- update any changes in language-specific package installation

examples/ruby/Gemfile

@@ -3,4 +3,4 @@
 
 source 'https://rubygems.org/'
 
-gem 'grpc', :git => 'https://github.com/grpc/grpc.git', :submodules => true, glob: 'src/ruby/*.gemspec'
+gemspec

examples/ruby/grpc-demo.gemspec

@@ -3,7 +3,7 @@
 
 Gem::Specification.new do |s|
   s.name          = 'grpc-demo'
-  s.version       = '0.5.0'
+  s.version       = '0.11.0'
   s.authors       = ['gRPC Authors']
   s.email         = 'temiola@google.com'
   s.homepage      = 'https://github.com/grpc/grpc'
@@ -17,7 +17,7 @@ Gem::Specification.new do |s|
   s.require_paths = ['lib']
   s.platform      = Gem::Platform::RUBY
 
-  s.add_dependency 'grpc', '~> 0.6'
+  s.add_dependency 'grpc', '~> 0.11'
 
   s.add_development_dependency 'bundler', '~> 1.7'
 end