Create teams and apply it's migration.

The teams are going to be the responisbles for the projects.
The test for the teams.
Update the user fixtures.
Add the realationship between Teams and Users.

This commit includes a migration to add a column on our database, the
relationships and a couple of tests just to be sure.
Complete delete the commented configurations on the Guardfile.
Adds Project model and apply its migration(s).
A new test for the Team model.
Add a new fields on the rails admin edit page for this two models.

A field to chose the team for the users. And a field to chose the name
of a team.
Adds 2 stylesheets full of boilerplate.
Adds 3 fonts (And it's variations).
Add the vendor/assets/fonts directory to our asset pipeline.
Add Spanish translations and set the default locale to es.
Add templates for the main menu and the footer.
Replace the title tag to use the variable @title if available.
Create the static controller and set our default root to static#index.
Update the spanish locale.
Create the teams controller.
Create Projects controller.
Adds the index template and wireframe styles.
Remove Minitest::Spec configuration.

We are using Unit Tests, so it isn't needed anymore.