Image Watermarker: Generate images with an watermark text

This can process an image to place an watermark text.

It supports the following customization features:

- Font size
- Uses TrueType fonts
- Angle of the text
- Shadowed text
- Smoothed or sharp text (with or without anti-aliasing)
- Supports several image formats: png, gif, bmp and jpeg
- Customizable horizontal and vertical spacing between two consecutive watermarks
- Can open images to be watermarked specifying the relative or absolute path including remote images retrieved over HTTP.

The class includes many comments within its code.