support for dashes in guard names

lib/guard.rb

@@ -82,7 +82,7 @@ module Guard
 
     def get_guard_class(name)
       try_to_load_gem name
-      self.const_get(self.constants.find{ |klass_name| klass_name.to_s.downcase == name.downcase })
+      self.const_get(self.constants.find{ |klass_name| klass_name.to_s.downcase == name.downcase.gsub('-', '') })
     rescue TypeError
       UI.error "Could not find load find gem 'guard-#{name}' or find class Guard::#{name}"
     end

spec/guard_spec.rb

@@ -57,6 +57,17 @@ describe Guard do
       end
     end
 
+    context 'with a name with dashes' do
+      it "returns the Guard class" do
+        Guard.should_receive(:try_to_load_gem) { |classname|
+          classname.should == 'dashed-class-name'
+          class Guard::DashedClassName
+          end
+        }
+        Guard.get_guard_class('dashed-class-name').should == Guard::DashedClassName
+      end
+    end
+
     context 'with an inline Guard class' do
       it 'returns the Guard class' do
         module Guard