Allow resetting counter

Author: rgabo

config.ru

@@ -14,9 +14,14 @@ get '/hi' do
 end
 
 get '/counter' do
-  @counter = REDIS.incr("counter")
+  @counter = REDIS.incr "counter"
   haml :counter
 end
 
+get '/counter/reset' do
+  REDIS.del "counter"
+  redirect '/counter'
+end
+
 use Sinatra::Application
 run ShowOff.new