Misc. code cleanup.

Improved code readability.
Updated Netbeans project files.

Updated for Netbeans 8.
Merge branch 'master' of https://github.com/hasselg/books-viewer

Conflicts:
	nbproject/build-impl.xml
	nbproject/configs/Run_as_WebStart.properties
	nbproject/configs/Run_in_Browser.properties
	nbproject/genfiles.properties
	nbproject/jfx-impl.xml
	nbproject/project.properties
	src/books/viewer/Viewer.java