[#1143035] Kanbanery: Call for paper - Retomar proyecto

* Remove attr_accessible from user
* Set strong params for sessions controller
* Set secret_key for devise
* Update routes to match Rails 4
* Rename database.sqlite to dabase
* Remove attr_accessible email form injections
* Config application and environments to support strong params
File's name was changed
Stylesheets modified
Working in progress to redesign
env variable fixed
only the variable
new images added
Images no necesaries
Home section and new profile section redesigned
New gem added
[##1159281] CFP - Redesign layout

* Add config to activate proposals
* Remove unnecesary paths from menu
* Replace img tags with rails image_tag helper
* Remove email from profile form
[#1159281] Add basic structure for new layout
[#1159281] Layout fixed
[##1159261] CFP - Edit/New Profile

* Adjust menu font styles
* Add content for titles
* Fix yield columns
* Refactor some css
[##1159471] CFP - Remove Profile Show

* Override profile controller create/update to redirect to root
* Remove show view
[#1159262] CFP - New Poposal

* Add new design of new proposal
* Add basic structure and styles for remaining days
Buttons of 'proposals' and 'new proposals' added
Some refactoring
Styles of proposal section designed
Comments basic structure