Removed database yml from git tracking, copied the existing one to database.yml.example for later reference.

Please run this command after you pull this commit  `git update-index --assume-unchanged config/database.yml` so that it stops tracking the file from your machine as well.
bootstrap-sass updated to test on heroku
Merge pull request #2 from tamarakorr/sass_issue_test

bootstrap-sass updated to test on heroku
request helper file added to for assitance methods in specs
factories.rb renames to factories/user.rb and factory's assosciations corrected
vacancies controller specs added
vacancies index efficiency improved by using eager load stop n+1 queries
it block message corrected
rspec console display format
vacancies can now to sorted based on NGO's name
vacancies sortable by method added to determine if they can be sorted by given field name
sortable_by? method added on NGO model also and used in vacancy model.
selected filters from view are sent as params to server
debugger gem added
Filter methods on vacancies model added for filtering.
fitler method name changed filter -> filtered_by
vacancies can now be filtered from the index view
sorting can be done over existing filters
type error on ngo's sortable_by method
vacancies filter_by method fail proof when filters argument is nil