Corrected fat-binary support. Closes GH-6

- Namespace mysql_api component into mysql library path
- Try search for {1.8, 1.9}/mysql_api inside mysql lib before directly
- Removed RUBY_PLATFORM conditional.

ext/mysql_api/extconf.rb

@@ -90,4 +90,4 @@ def default_mysql_config_path
   end
 end
 
-create_makefile("mysql_api")
+create_makefile("mysql/mysql_api")

lib/mysql.rb

@@ -1,11 +1,9 @@
 # support multiple ruby version (fat binaries under windows)
 begin
-  require 'mysql_api'
+  RUBY_VERSION =~ /(\d+.\d+)/
+  require "mysql/#{$1}/mysql_api"
 rescue LoadError
-  if RUBY_PLATFORM =~ /mingw|mswin/ then
-    RUBY_VERSION =~ /(\d+.\d+)/
-    require "#{$1}/mysql_api"
-  end
+  require 'mysql/mysql_api'
 end
 
 require 'mysql/version'

tasks/native.rake

@@ -8,10 +8,13 @@ Rake::ExtensionTask.new('mysql_api', HOE.spec) do |ext|
   # reference where the vendored MySQL got extracted
   mysql_lib = File.expand_path(File.join(File.dirname(__FILE__), '..', 'vendor', "mysql-#{MYSQL_VERSION}-win32"))
 
+  # where native extension will be copied (matches makefile)
+  ext.lib_dir = "lib/mysql"
+
   # define target for extension (supporting fat binaries)
   if RUBY_PLATFORM =~ /mswin|mingw/ then
     ruby_ver = RUBY_VERSION.match(/(\d+\.\d+)/)[1]
-    ext.lib_dir = "lib/#{ruby_ver}"
+    ext.lib_dir = "lib/mysql/#{ruby_ver}"
   end
 
   # automatically add build options to avoid need of manual input