Change models, new migrations, fix front and make tests work

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

priv/repo/migrations/20180110092600_create_events.exs

@@ -0,0 +1,26 @@
+defmodule Eventos.Repo.Migrations.CreateEvents do
+  use Ecto.Migration
+
+  def change do
+    create table(:events) do
+      add :title, :string, null: false
+      add :slug, :string, null: false
+      add :description, :string, null: true
+      add :begins_on, :datetimetz
+      add :ends_on, :datetimetz
+      add :geom, :geometry
+      add :state, :integer, null: false
+      add :public, :boolean, null: false
+      add :large_image, :string
+      add :thumbnail, :string
+      add :publish_at, :datetimetz
+      add :organizer_id, references(:accounts, on_delete: :nothing), null: false
+
+      timestamps()
+    end
+
+    create index(:events, [:organizer_id])
+    create unique_index(:events, [:slug])
+
+  end
+end