1.1-SNAPSHOT update (fixes and documentation)

[hubert....@gmail.com]

Maven Overview Plugin 1.1-SNAPSHOT has been updated.

Critical bug fix: http://code.google.com/p/maven-overview-plugin/issues/detail?id=6
Installation has been simplified a lot:
http://maven-overview-plugin.googlecode.com/svn/site/usage.html
Maven generated site now available here:
http://maven-overview-plugin.googlecode.com/svn/site/index.html