Add ruby bin/rails to win in /app.
Update year text in /app.
remove a line mentioning about installing git and ssh-keygen

RailsInstaller 2.2.2 contains git and generates ssh private and public
keys.
Merge pull request #148 from igaiga/fix_trivial_problems_in_the_app_page

Fix trivial problems in the app page
Merge pull request #149 from eitoball/no_need_to_install_git_nor_ssh_keygen_on_windows

Remove a line mentioning about installing git and ssh-keygen
change to check README.rdoc instead

`rails new` command generates `README.rdoc` since Rails 4. So, I
would like to propose to change to checking the existence of
`README.rdoc` instead of creating `README` in
[Push Your App to GitHub](http://guides.railsgirls.com/github/).
Merge pull request #150 from eitoball/check_readme_rdoc_instead

Check README.rdoc instead
Switch from YouTube to Vimeo for Rails Girls Sofia 2014's video
add anchor links
fix to render correctly
Update 2012-04-18-guide.markdown

Adds mentions to the new Tumblr submit blog post link
Merge pull request #152 from eitoball/fix_to_render_correctly

Fix to render correctly
remove backslash that was meant to escape underscore

It seems that you don't need to escape in highlight tag.
correct a simple typo in "Guides"
Merge pull request #154 from eitoball/correct_simple_typo_in_guide

correct a simple typo in "Guides"
Merge pull request #153 from eitoball/no_need_to_escape_in_highlight_tag

Remove backslash that was meant to escape underscore
fix punctuation error in "Guide to the Guide of Rails Girls"
update to install and use 2.1.1 for rbenv on OS X 10.9
don't use unneccessary css !important tags

As far as I can tell, removing !important doesn't change the
behavior here.

Plus, given the limited time of the event, I can think of lots of
other things I'd prefer to talk about, rather than explain this
particularly contested css feature. ;)
Merge pull request #155 from eitoball/update_to_2_1_1

Update to install and use 2.1.1 for rbenv on OS X 10.9