Button state colors

State buttons inspired by alert component colors and can add additional contextual sense.

<!-- Source -->
<button class="btn btn-state-primary" type="button">Primary</button>
<button class="btn btn-state-secondary" type="button">Secondary</button>
<button class="btn btn-state-success" type="button">Success</button>
<button class="btn btn-state-info" type="button">Info</button>
<button class="btn btn-state-warning" type="button">Warning</button>
<button class="btn btn-state-danger" type="button">Danger</button>
<button class="btn btn-state-light" type="button">Light</button>
<button class="btn btn-state-dark" type="button">Dark</button>
<button class="btn btn-state-indigo" type="button">Indigo</button>
<button class="btn btn-state-orange" type="button">Orange</button>
<button class="btn btn-state-pink" type="button">Pink</button>
<button class="btn btn-state-purple" type="button">Purple</button>
<button class="btn btn-state-teal" type="button">Teal</button>