LittleEndianDataOutput, BmpWriter: Fixed API, changed usages.
BmpWriter: Reformatted whitespace.
BmpReader, BmpWriter: Added private constructors.
LittleEndianDataInput, LittleEndianDataOutput: Simplified code.
LittleEndianDataInput: Expanded imports.
MandelbrotDemo, SimpleDemo: Changed I/O code to use try-finally.
SimpleDemo: Fixed indentation of blank line.
SimpleDemo: Added explanatory comment.
AbstractRgb888Image: Added class, retrofitted implementations of Rgb888Image to use it.