Fix my_first_test.md
Fix blog_get.md
Fix install.md

Change {$PROJECT_PATH} to {$PACKAGE_DIR}
Fix ja/introduction.md

Fix style
Fix my first tutorial
Merge pull request #57 from kenjis/fix_my_first

Fix my first tutorial
Merge pull request #56 from kenjis/fix_introduction.md

Fix ja/introduction.md
Merge pull request #55 from kenjis/fix_install.md

Fix install.md
Merge pull request #45 from kenjis/fix_first_test

Fix my_first_test.md
Merge pull request #53 from kenjis/fix_blog_get

Fix blog_get.md