title: Vuetify validation using multiple rules
body: <p>Is it possible to assign multiple rules to validate input? For example I have two rules:</p>
  
  <pre><code>alphaRule: [
        v =&gt; /[a-zA-Z]+$/.test(v) || 'Field must only contain letters'
      ],
  requiredRule: [
                 v =&gt; !!v || "required field"
              ]
  </code></pre>
  
  <p>And I have number of controls. Some of them need only requiredRules, some - only alphaRule, but some - combination of alphaRule and requiredRule.</p>
  
  <p>Can I combine it together?</p>
  
  <p>something like </p>
  
  <pre><code>:rules = "alphaRule, requiredRule"
  </code></pre>