updated slf4j version to 1.7.5

added a grouped version property
Merge remote-tracking branch 'upstream/master'
Changed the underlying Swing parent from JFrame to Window

This allows for Swing panels to be embedded in JFrame or JDialog
added comments
added swing example readme
added link to examples.md
fixes hyperlink
updated examples
added swing example
Merge pull request #4 from croydondias/master

Changed the underlying Swing parent from JFrame to Window