Create an apps core plugin.

This creates the following commands:

- apps
- apps:create <app>
- apps:destroy <app>

It also:

- makes `delete` an alias for `apps:destroy`
- adds confirmation to `apps:destroy`
- allows a developer to remove apps that have been created via apps:create but have not been deployed

Refs #87
Refs #543
Refs #586
Closes #599
Refs #655
Refs #656
Refs #685
Closes #757

plugins/config/commands

@@ -53,12 +53,14 @@ config_styled_hash () {
 config_restart_app() {
   APP="$1";
 
-  echo "-----> Releasing $APP ..."
-  dokku release $APP
-  echo "-----> Release complete!"
-  echo "-----> Deploying $APP ..."
-  dokku deploy $APP
-  echo "-----> Deploy complete!"
+  if [[ -f "$DOKKU_ROOT/$APP/CONTAINER" ]]; then
+    echo "-----> Releasing $APP ..."
+    dokku release $APP
+    echo "-----> Release complete!"
+    echo "-----> Deploying $APP ..."
+    dokku deploy $APP
+    echo "-----> Deploy complete!"
+  fi
 }
 
 config_write() {