Add support for ImageProcessor to accept BufferedImage objects as input

Update TexturePacker2 to accommodate ImageProcessor changes and exposes new
constructor and method.
Merge pull request #388 from manuelbua/texturepacker2-addimage

Add support for ImageProcessor to accept BufferedImage objects as input
Ouch, fix missing javadocs for null parameter
Merge pull request #389 from manuelbua/fix-javadoc

Ouch, fix missing javadocs for null parameter