Remove Rails 3 attr_accessors

We don't have to add other code for Rails 4 Strong Parameters.
Replace /views to app/views in conjunction with other view path.
Merge pull request #127 from sho-h/remove-rails3-accessors

Remove Rails 3 attr_accessors
Merge pull request #128 from sho-h/fix-view-path

Replace /views to app/views in conjunction with other view path.
Add operation to force user redirect to login page if not logged in.
Migrate to bootstrap version 3
Merge pull request #130 from mrkn/bootstrap3

Migrate to bootstrap version 3
New tutorial for adding a Gravitarto the rails girl app
updated spelling and gramatical errors
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putting gravitar file back
add blurb about new Gravatar guide to Guide home page
change from gravItar to gravAtar and make Rails Girls two words
Merge pull request #131 from catherine-jones/master

New tutorial for adding a Gravitartar to the rails girl app
update dependency
Replace before_filter to before_action
Change words to lead before_action close to top of controller
Merge pull request #129 from sho-h/redirect-login-page

Add operation to force user redirect to login page if not logged in.
add guide: design using HTML & CSS
add file header
add design guide English copy.