add doc, rewrite_tag_filter
Add 'INCLUDE' pragma to share same content
Merge pull request #71 from fluent/add-include-pragma

Add 'INCLUDE' pragma to share same content
add a description for INCLUDE pragma
fix the mistake for the INCLUDE pragma's explanation
Add Gemfile.lock to .gitignore file
Copy in_tail.txt ja/int_tail.txt
Replace "Itis" with "It is"
fix a trivial typo in out_forward.txt
Merge pull request #74 from choplin/patch-1

fix a trivial typo in out_forward.txt
Translate in_tail.txt in Japanese
Merge pull request #72 from suzukaze/add-gitignore

Add Gemfile.lock to .gitignore file
Merge pull request #75 from suzukaze/in_tail_plugin

Translate in_tail.txt in Japanese
Merge pull request #73 from suzukaze/fix-typo-in_tail.txt

Replace "Itis" with "It is"
Copy in_exec.txt ja/in_exec.txt
Translate in_exec.txt in Japanese
Merge pull request #76 from suzukaze/ja-in_exec

Translate in_exec.txt in Japanese
Add in_unix link to japanese toc. fixes #77
Add GPG key section to rpm / deb installation page
edit "before-install.txt" for clarity