update introductory section in README.jp.md
Update Route and Return values sections in README.jp.md
Add Custom Route Matchers section in README.jp.md
Update Views / Templates section in README.jp.md
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Correct some wordings
Add Using Sessions section in README.jp.md
Update Halting and Passing sections in README.jp.md
Add original english titles to each section in README.jp.md
Add missing sections in original language
Add TOC and modify section titles in README.jp.md
Fix broken links in toc
Update Mime Types, Accessing the Request Object and Configuration sections in README.jp.md
Update Error Handling, Rack Middleware, and Testing, Sinatra::Base sections in README.jp.md
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Update Generating URLs, Browser Redirect, Cache Control, Sending Files, Attachments, Dealing with Date and Time, and Looking Up Tempalte Files in README.jp.md
Update Configuration and Environments sections in README.jp.md