vote to add mvc video

I'm suggesting adding an mvc video from youtube. It's something I use personally when teaching and there's a certain amount of authority and succinctness a video has over a text explanation.
added descriptive text to video expanation
use Erector v0.10.0
link to Github Guides. Closes #349
Merge pull request #350 from alexch/erector-10

use Erector v0.10.0
install i18n gem
Config locale via I18n.locale
I18n-ify general words
fix URL escaper when making back-related links so that it works for non-Latin chars
improve localized server instruction
Fix upvote_topic_path ref that was incorrectly stated as topic_upvote_path
Remove 'learn-to-code' step index in favor of declaring next_step in each file

Move learn-to-code images into an /img/ subdirectory
Add jQuery and CSS to titleizer for benefit of Frontend site
Serve up /:site/:subdir/:file.:ext paths directly from disk for all values of subdir

Previously this was only true if the subdir was /img/
Consolidate declaration of DOC_TYPES to a single list
Upgrade all Rails 4.0 refs to 4.1

Include big scary blue tip warning on the 'Create a Rails App' page
stating that rails 4+ is required
Set ruby to 2.1 in the Gemfile
Intermediate Curric: fix markdown fail in formatting of 'replies_controller'
Upgrade Sinatra to 1.4
Add .travis.yml to enhance working-ness of Travis build