added badges to readme
removed unused columns from the dataset (stored in the response_set)
protect dataset attributes from mass assignment
redirect to user to dashboard on start_questionnaire error rather than dataset
refactored start_questionnaire slightly, removed unreachable redirect, trimmed down code slightly
corrected dataset user assignment
added stub questionnaire for easier testing
added note about GB stub version
Added search queries for certificates
Merge remote-tracking branch 'origin' into code-maintainence

Conflicts:
	db/schema.rb
Merge pull request #445 from theodi/feature-change-badge-code

Change badge code
Merge remote-tracking branch 'origin' into code-maintainence

Conflicts:
	db/schema.rb
schema update
added documentation_url back to the dataset
trigger documentation_url to be assigned for all datasets
removed unnecessary 'and return'
Minor styling fixes
Automatic whitespace fixing
Moved search page and setup basic search query
Updated dataset show page in preparation for new search features