Merge pull request #248 from nobu/srcs

Add `srcs` target to prepare to build

Rakefile

@@ -80,9 +80,11 @@ else
   end
 end
 
-task :compile => ['lib/racc/parser-text.rb']
+desc 'Make autogenerated sources'
+task :srcs => ['lib/racc/parser-text.rb']
 
-task :build => "lib/racc/parser-text.rb"
+task :compile => :srcs
+task :build => :srcs
 
 task :test => :compile