Added rake tasks for managing the gem

Rakefile

@@ -36,3 +36,15 @@ Rake::GemPackageTask.new($specification) do |package|
   package.need_tar = true
 end
 
+gem_file = "pkg/#{$specification.name}-#{$specification.version}.gem"
+
+desc "Build and install the latest gem"
+task :install => :gem do
+  sh("gem install --local #{gem_file}")
+end
+
+desc "Build and release the latest gem"
+task :release => :gem do
+  sh("gem push #{gem_file}")
+end
+