Add image for project
Fix broken tests

Signed-off-by: Vinicius Franco <viniciusf.arantes@gmail.com>
Signed-off-by: Thiago Ribeiro <thiagitosouza@hotmail.com>
 Refactored Project_controller.rb and project_image.rb
Fixed tests in project_controller.rb  and closes #25
Making suggested changes
Replacing .sample files
Fixed broken cucumber tests
Fixed missing </div> on project form
Removed from schema projects table
Tabs identation converted into spaces for project and project_image
Removed unecessary changes to samples
Restored <hr> to projects show
Different behaviour for project image not provided
No image asset replaced by a icon
Doubled project_image size
Renamed ProjectImage image_url to url
Removes image_url on update
set_project sets the project_image as well
Fixed project image creation.

Signed off by: Diego Araújo <diegoamc90@gmail.com>
Project image form field adjusted and unit tests mocked correctly