refactored student.searchStudensByProgrammingLanguage and student.searchStudensByLanguage
refactored sort_decisions
added acceptance test #53
adapt method and variable names to coding conventions
students now must have at least first_name and last_name, adapted controller tests to that
implemented search method to find matching students (programming language, language) #56
find matching students button now uses the attributes from the job offer #56
Merge remote-tracking branch 'origin/develop-ja' into develop-ja-find-matching-students
removed label from submit button
added helper test for job offers #56
Merge branch 'develop-ja-localisation' into develop-ja

Conflicts:
	db/seeds.rb
Merge branch 'develop-ja' into develop
merged the show matching students button into the language version
Merge branch 'develop-ja' into develop

Conflicts:
	app/views/job_offers/_form.html.erb
added controller tests for filter in job offer and for matching in student
Added simple form of typecheck
small refactoring in filter methods in job offer model
#73 job_offers are sorted by default by creation date. corresponding radio button is selected from the beginning. adapted model test. added view test.
Merge branch 'develop-ja' into develop-ja-sort-job-offers

Conflicts:
	app/views/job_offers/index.html.erb
Merge branch 'develop' into develop-ja