Added screenshots for the Example Graphs wiki page.
Updated the .gitignore file to ignore docsets.
Updated the read me file and Doxygen main page.
Updated the Doxygen config files for Doxygen 1.8.6.
Modified the automatic axis labeling policy to always make at least two major tick marks. Fixed issue #45.
Added an axis property to control the offset direction of the title independent of the tick direction. Fixed issue #1.
Added *.orig to the .gitignore file.
Merge branch 'master' into release-2.0