Add `rails-erd` gem and update Vagrantfile.

* Vagrant now uses default sharedfolders. While not using guard, has better performance.
Merge branch 'develop'

* develop: (97 commits)
  Fix problem with Property associations.
  Add seeds for remaining models
  Fix tests to work with new factories.
  Add seeds for development environment.
  Add ffaker gem & update some factories.
  Creates a RealEstate association if created user is an Agent. Fixes #15 and #16.
  Add I18n to nav partial.
  Add I18n to user model and views
  Add I18n to Detail model and views
  Add I18n to Realestate model and views
  Add I18n to Category model and views
  Add I18n to Property model and views.
  Configure routes for I18n
  Add I18n to Town model and views
  Add prompt to role select on User form.
  Add agent permissions on User model.
  Remove back link from Realestate edit if not admin
  Add dashboard link to admin layout logo.
  Remove Agent's field from Realestate form
  Add hound configuration
  ...

Conflicts:
	Gemfile
	Gemfile.lock
	Vagrantfile
Add column `permalink` to `Category` model.
Autofill `permalink` before saving.
Generate permalink automatically after create an instance.
Add permalink to Town.
Add permalink to Detail.
Add permalink to Realestate.
Add permalink to Property.
Run migrations.
Merge branch 'develop' into add-permalinks

* develop:
  Fix Property seeding
  Use `find_by` as Marcus said.
  Fix auth_token cookies issue.
Add title to Property.
Merge branch 'add-permalinks' of github.com:remanager/rem into add-permalinks

* 'add-permalinks' of github.com:remanager/rem:
  Add title to Property.
  Run migrations.
  Add permalink to Property.
  Add permalink to Realestate.
  Add permalink to Detail.
  Add permalink to Town.
  Generate permalink automatically after create an instance.
  Fix Property seeding
  Use `find_by` as Marcus said.
  Fix auth_token cookies issue.

Conflicts:
	app/helpers/application_helper.rb
	app/models/category.rb
Add title field to the Property form.
Fill title on Property integration test.
Unhounding.
Merge branch 'develop' into add-permalinks

* develop: (26 commits)
  Unhounding.
  Change test to check if it assigns fine. but fails.
  Change redirect_to to render in public#search
  Add functionality & test.
  Change form_for to form_tag.
  Change routes order.
  Add public_controller_spec. Some pending.
  Change where to find_by fixes test. Render instead of redirect.
  Change where to find_by. Fix test.
  Add crappy form on realestate layout. (Not working yet)
  Implement search by property, rename params/args & clean comments.
  Implement search by ref.
  Remove to_param from Category. Brought from other branch by mistake.
  Add test to search by category & details.
  Add `to_a` to tests to get the `size`.
  Add functionality to search by details.
  Add tests to find by details.
  Fix Vagrant file. It might be corrupted merging master.
  Add test & function for searching by category.
  Add search action on public controller.
  ...

Conflicts:
	app/models/category.rb
Merge pull request #22 from remanager/add-permalinks

Add permalinks