Create controller generator for devise (rails generator devise:controllers users -c sessions)

### Step1 (Waiting for reivew)
Create controllers templates, and create controller generator to copy ALL templates to rails app directory

### Step 2 (Working on It)
Create specific controllers using params provided by user, for example:
```ruby
rails generate devise:controllers users -c sessions confirmations
```

### Step 3
Discuss on how should we handle strong params in controllers

### Step 4
Other issues on controllers generator.