added requires_csrf_token decorator to views
replaced requires_csrf_token with ensure_csrf_cookie
ready-d dockerfile tutorial (fix on introduction page)
css issue in dockerfile tutorial, migration for x-real-ip
Fixed error in model/view
Added /tutorial/api/metrics/ endpoint for stats.
added link to michael crosby's post
updated copy
Merge pull request #1 from dotcloud/add-crosby-post

added link to michael crosby's post
Fixed urls
fixed twitter completion message
removed hashtag from twitter message
Grammar edits on lesson one
Typo fix: usefull -> useful
Fix typo specifieng > specifying
Fix typo in step 7

"usefull" => "useful"
Use appropriate mouse cursor on step buttons

The user will have a stronger feeling that they're clickable.
Added level2 of the dockerfile tutorial
Merge remote-tracking branch 'origin/master'
Added link to level1 on level1