Avoid Ruby 1.8.7

[hdm at metasploit.com (H D Moore)]

The latest stable release of Ruby (1.8.7) changes how relative class names 
are located. This breaks all sorts of things in Metasploit, from 
the 'NDR' errors people saw in the DCERPC modules, the file system 
interaction in Meterpreter. For the time being, you may wish to just 
avoid Ruby 1.8.7 until we find a sane workaround to these changes.

-HD

PS. We are pushing for a 3.2 stable release next month! 

PPS. Still some seats left in my training class at SecTor for folks who 
wan't a hands on approach to becoming Metasploit ninjas. 
http://sector.ca/moore_training.htm