Update and rename README.markdown to README.md

Update the installation instructions.
Merge branch 'master' of github.com:valo/maycamp_arena

* 'master' of github.com:valo/maycamp_arena: (114 commits)
  Update and rename README.markdown to README.md
  Mograte the site to a new hosting with different IP.
  Fixing the reset password requests
  Updated the newrelic tracking gem
  Security update of rails
  Adding a utf-8 sanitizer in the rack middleware.
  Updating capistrano
  Fixing an exception when the page is out of range
  Removing the gem in the vendor/cache. There is no need to keep all the gems in the source control.
  Added caching on the status page, which depends on the largest updated_at value in the runs table.
  The practice area table depends on the last contest in the system. If a new contest is added the cache should be invalidated
  Added caching to the practice area results for a user. The fragment expires when the user submits a new run
  Add the page number to the cache key
  Make the dalli client threadsafe
  Adding the connection pool gem
  Adding a connection pool to the memcached client
  Switching to dalli store. Hopefully this resolves the timeout errors on dreamhost
  Added caching of the ranklists which depends on the last run in the system. As soon as a new run is added or the last one is changed, the cache will expire and will be rebuilt
  Changed the main page to show the rankings by practice, because the rating are not moving any more.
  Updated the newrelic agent
  ...

Conflicts:
	README.markdown