Tagging version 1.7.3 1.7.3

Tagging version 1.7.2 1.7.2

Tagging version 1.7.1 1.7.1

Tagging version 1.7.0 1.7.0

Tagging version 1.6.0 1.6.0

This is version 1.1.3 of the headsweeper plugin

changes:
 - support for Minecraft v1.8.7
 - added chat tag
 - minor fixes and javadoc changes