#72 added programming languages and languages checkboxes
Merge remote-tracking branch 'origin/develop-ja' into develop-ja-sort-search-filter

Conflicts:
	app/controllers/job_offers_controller.rb
	app/models/job_offer.rb
	app/views/job_offers/_sort_filter_search.html.erb
adapt controller test to find_jobs method
tried to implement programming language filter in model
#72 completed - implemented filter function