Release Name: 0.6.0

Notes:
== Introduction 

rubyrrdtool provides ruby bindings for RRD functions (via librrd), with
functionality comparable to the native perl bindings. See examples/minmax.rb
or the unit tests in the test directory for scripts that exercise the
rrdtool functions. 


Changes:
* applied patches (thanks to Hrvoje Marjanovic, Akihiro Sagawa and Thorsten von Eicken)
* changed version, graph, xport methods to be class methods
* removed dump method from pre two-arg-dump rrdtool versions
* fixed compiler warnings in debug output
* hoe-ified Rakefile