Merge pull request #44 from murashin/master

avoid invalid byte sequence error
Merge pull request #45 from murashin/master

add support for data generated by misc/plugin/attach.rb
Remove trailing white spaces
Extract convert_attachments

But I don't test this commit, yet.
I don't have enough environment for test.
Use meaningful names
Use extracted local variable
add missing arguments
fix Plugin Error

* fix "Plugin Error: undefined method `set_conf' for Hiki::Util:Module"
  when using {{recent(10)}}, {{toc}}, and etc.
remove unwanted encoding conversion.
Merge branch 'work1'
Merge branch 'work2'
Merge branch 'master' of https://github.com/murashin/hiki