Adding HTML5 autofocus to search bar, CSS improvement

Adding HTML5 autofocus to search bar + tiny CSS improvement
Add ja/development/exceptions
Fixed all the following which okonomi pointed out.
- "400番台" is correct.
- All CakeExceptions and HttpExceptions above extend this class.
  This line is not needed.
- "継承しており" is correct.
translated 'testing' section from top to 'Test Case Conventions'
	new file:   ja/development/testing.rst
translated 'testing' from top to 'Creating Your First Test Case'
translated all titles of 'testing'
translated from top to 'Test Case Lifecycle Callback'
translated 'testing' from top to 'Dynamic data and fixtures'
translated 'testing' from head section to Fixtures section
translated 'testing' from head seciton to 'Model Testing' section and 'Creating Test Suite' section
translated 'testing' without 'Controllers testing', 'Helpers testing' and 'Components testing' sections
translated some subsections of 'Testing Controllers' in 'testing'
Fix typos and grammar in the blog tutorial
Fix typos and grammar in the authentication and authorization tutorial
Merge pull request #419 from ataylor32/auth-tutorial-typos

Fix typos and grammar in the authentication and authorization tutorial
Merge pull request #406 from waterada/terada_exceptions

Add ja/development/exceptions
Merge pull request #418 from ataylor32/blog-tutorial-typos

Fix typos and grammar in the blog tutorial
Update ja/development/testing.rst

just a little modify and shorten many lines' length
Remove link to nowhere.

The whole sentence was lies, so remove it too.
Fixing pagination examples using 'dir' and not 'direction'