add backtraces and verbose messages to fog errors

lib/fog.rb

@@ -29,7 +29,9 @@ require 'fog/ssh'
 module Fog
   module Errors
 
-    class Error < StandardError; end
+    class Error < StandardError
+      attr_accessor :verbose
+    end
 
     class MockNotImplemented < Fog::Errors::Error; end
 

lib/fog/aws/ec2.rb

@@ -234,6 +234,7 @@ module Fog
                 Fog::AWS::EC2::Error.new("#{match[1]} => #{match[2]}")
               end
               new_error.set_backtrace(error.backtrace)
+              new_error.verbose = error.message
               raise new_error
             else
               raise error

lib/fog/bluebox.rb

@@ -82,11 +82,14 @@ module Fog
         begin
           response = @connection.request(params.merge!({:host => @host}))
         rescue Excon::Errors::Error => error
-          case error
+          raise case error
           when Excon::Errors::NotFound
-            raise Fog::Bluebox::NotFound
+            new_error = Fog::Bluebox::NotFound
+            new_error.set_backtrace(error.backtrace)
+            new_error.verbose = error.message
+            new_error
           else
-            raise error
+            error
           end
         end
         unless response.body.empty?

lib/fog/rackspace/servers.rb

@@ -99,11 +99,14 @@ module Fog
               :path     => "#{@path}/#{params[:path]}"
             }))
           rescue Excon::Errors::Error => error
-            case error
+            raise case error
             when Excon::Errors::NotFound
-              raise Fog::Rackspace::Servers::NotFound
+              new_error = Fog::Rackspace::Servers::NotFound
+              new_error.set_backtrace(error.backtrace)
+              new_error.verbose = error.message
+              new_error
             else
-              raise error
+              error
             end
           end
           unless response.body.empty?

lib/fog/slicehost.rb

@@ -86,11 +86,14 @@ module Fog
         begin
           response = @connection.request(params.merge!({:host => @host}))
         rescue Excon::Errors::Error => error
-          case error
+          raise case error
           when Excon::Errors::NotFound
-            raise Fog::Slicehost::NotFound
+            new_error = Fog::Slicehost::NotFound.new
+            new_error.set_backtrace(error.backtrace)
+            new_error.verbose = error.message
+            new_error
           else
-            raise error
+            error
           end
         end