Add email and url attributes for RubyGem package

Rakefile

@@ -3,6 +3,8 @@ require 'echoe'
 
 Echoe.new("rbfnv") do |p|
   p.author = "Robey Pointer (1.8.x) / Susan Potter (1.9.x)"
+  p.email = "robey@lag.net / me@susanpotter.net"
+  p.url = "https://github.com/mbbx6spp/rbfnv"
   p.project = "rbfnv"
   p.summary = "FNV hash implementation for ruby"
   p.rdoc_pattern = /README|TODO|LICENSE|CHANGELOG|BENCH|COMPAT|exceptions|behaviors|rails.rb/