Use accessibilityLabel text as button title

Signed-off-by: Jai Govindani <jai@monstermedia.co.th>
Updated .gitignore

Signed-off-by: Jai Govindani <jai@monstermedia.co.th>
Changed button to subclass of DemoButton with MTLabel as label for customizable line height

Signed-off-by: Jai Govindani <jai@monstermedia.co.th>
Changed selection border color and corner radius

Signed-off-by: Jai Govindani <jai@monstermedia.co.th>
Worked on ZI-1606, fixed tileButton label start position (assume image size = 40px)

Signed-off-by: Jai Govindani <jai@monstermedia.co.th>
Fixed warning

Signed-off-by: Jai Govindani <jai@monstermedia.co.th>