Pin mini_magick to 3.5.0

Until probablycorey/mini_magick#4 is fixed, this won't work on Windows, so suggest the version that does work.
Add note about attr_accessible

This won't work without this.
Fix punctuation error
Change instances of "girls" outside of "Rails Girls" to women to be more
consistent with the railsgirls.com homepage copy "Our aim is to give tools
and a community for women to understand technology"
Merge pull request #81 from steveklabnik/patch-2

Pin mini_magick to 3.5.0
Adds github guide link to front page
Typo fix
Fixes the GitHub guide URL
Added a Directions for using Bundler for Development - This enable you to work on Bundlers open source code
add videos
Add videos
Merge pull request #84 from jendiamond/bundlerfordev

Added a Directions for using Bundler for Development - This enable you t...
Fixes the Jekyll problems w/ video and adds vimeo.rb
Update 2013-07-25-videos.markdown
fixing video whitespace
Merge branch 'master' of https://github.com/railsgirls/railsgirls.github.com
Fixes errors in the HTML
Now Maruku is actually cool with the HTML
Removes unnecessary serve directory
Changes Bundler development permalink to match the standard