Issue #18  Botao do twitter adicionado.

 Mudanças a serem submetidas:
	modificado: app/helpers/jobs_helper.rb
	modificado: app/views/jobs/show.html.erb
	modificado: app/views/layouts/application.html.erb
Merge pull request #34 from jhonylucas74/iss18

Issue #18  Botao do twitter adicionado.
Changes color of Tweet button
pt-br typo
created scopes for ordering
Gerando seeds no setup do banco
Merge pull request #37 from lccezinha/improve-seeds

Gerando seeds no setup do banco
added pry-rails on test/dev environments
created slug field on Job model
included sluggable concern into job model
updated job factory
created sluggable model concern
Validação de email + novos specs
included slug tests and refactoring in job_spec
fixed slug validation on update only
changing job links to use slug instead of id
redirects user to show after create a job
changed :desc scope to default_scope on job.rb
isolating sluggable concern specs
Trocando should por expect