v0.4.0

• Added optional tileViewportStyle prop as a function to determine style of tile viewport. This function leverages Function.prototype.call().

• Added optional thumbnailStyle prop as a function to determine style of each gallery thumbnail. This function leverages Function.prototype.call().

• Refactored implementation of onSelectImage prop. This function leverages Function.prototype.call().

• Refactored implementation of onClickThumbnail prop. This function leverages Function.prototype.call().

• Refactored implementation of lightboxWillOpen prop. This function leverages Function.prototype.call().

• Refactored implementation of lightboxWillClose prop. This function leverages Function.prototype.call().