moving some content from wiki to readme to put social contract up front
fixing a link on readme
Update survey_section_sweeper.rb

Changed expire_fregment to expire_fragment.  Think this was a typo; not sure how this slipped by for so long?
Merge pull request #465 from bigtunacan/patch-1

Update survey_section_sweeper.rb
Merge branch 'master' into rails4

* master:
  Update survey_section_sweeper.rb
  fixing a link on readme
  moving some content from wiki to readme to put social contract up front

Conflicts:
	app/models/survey_section_sweeper.rb
removing whitelisted attributes
removing whitelisted attributes
protected attribute specs
fixing next section button
refactoring classes with ActiveSupport::Concern
use surveyor common operators instead of aliasing them through a class method in ValidationCondition