Add a gem rake task + migrate #convert_key for AS test suite compat

Author: methodmissing

Diff for: Rakefile

@@ -65,4 +65,9 @@ desc "run benchmarks"
 task :bench do
   ruby "bench/bench.rb"
 end
-task :bench => :build
+task :bench => :build
+
+desc "build gem"
+task :gem do
+  sh "gem build hwia.gemspec"
+end

Diff for: lib/hwia_rails.rb

@@ -6,10 +6,15 @@ class Hash
 end
 
 class StrHash
-  alias convert_key convert  
   def stringify_keys!; self end
   def symbolize_keys!; self end
-  def to_options!; self end  
+  def to_options!; self end
+  
+  protected
+  # AS test suite compat only
+  def convert_key(key)
+    key.kind_of?(Symbol) ? key.to_s : key
+  end  
 end
 
 begin