Dev jony

added wall:

spec/factories/walls.rb

spec/models/wall_spec.rb

db/migrate/20141003011707_create_walls.rb

app/models/wall.rb

@jonybravo I am gonna write in english, just because the code is in english and it's easier to make comments(if you prefer in portuguese let me know…)

Which text editor are you using? Where do you edit your files? I use one called Sublime, if you willing to give it a try its really good!

Also do you see the red symbol at the end of the file? Basically is, github detects end of files through a new empty line. And this is telling us this file has no new empty line. it's important as you can read here(http://unix.stackexchange.com/questions/18743/whats-the-point-in-adding-a-new-line-to-the-end-of-a-file), but dont worry about the reason for now if you dont want to.