Position adjustment

I found it hard to properly position joyride boxes over page elements so I added option to manually adjust each tip, e.g.
```html
  <li
    data-selector='button.meeting_type'
    data-options='tipLocation:bottom;tipAdjustmentX:-25'>

    <h3>Meeting Type</h3>
    <p>
      You can use this button to quickly set type of the meeting scheduled with candidate.
    </p>
  </li>
```