specify Ruby version with `.ruby-version` instead of `.rvmrc`

This seems to be the new way of doing things. It's compatible wtih more
Ruby version managers.
Merge pull request #50 from patbl/master

specify Ruby version with `.ruby-version` instead of `.rvmrc`
Remove .ruby-gemset.sample
Disallow robots from crawling user pages
get rid of an annoying warning
get rid of an annoying warning
add a user and a prediction
add a second user
build a response
add unjudged prediction
add judged prediction
add a commented prediction
add debugger
update Gemfile.lock
Merge pull request #51 from kiba/master

Seed data and Gemfile tweaks
Update factory girl.

[#66380498]
Include FactoryGirl in spec_helper.

[#66380498]
Fix a typo in response notification spec.

[#66380498]
Define factories to be used in prediction and notification specs.

[#66380498]
1. Update prediction model and controller to handle scenarios when
predictions do not have parameter "private".

2. Move prediction privacy specs from model specs to controller specs
and update other related specs.

[#66380498]