[ja] follow up core-libraries/components/authentication section
provide ability for rounding
versionadded
return early for redirects
redirect too much
add missing redirects
Added note about Sanitize deprecation in migration guide and removed it's page.
Added a few readability and consistency edits to sessions
Merge pull request #685 from bcrowe/session-edits

Added a few readability and consistency edits to sessions
Merge pull request #684 from ADmad/deprecated-sanitize

Added note about Sanitize deprecation in migration guide
Fix a small PHP syntax error in 'Using and Configuring Helpers'.
Merge pull request #686 from jaysh/master-helpers-example-syntax-error

Fix a small PHP syntax error in 'Using and Configuring Helpers'.
[ja] follow up #686
Fix a small PHP syntax error in 'Using and Configuring Helpers' on the French version (previously fixed in English in #686).
Fix the comment inside the mix() method.
Merge pull request #687 from jaysh/master-helpers-example-syntax-error

[FR] Fix a small PHP syntax error in 'Using and Configuring Helpers'
Merge pull request #676 from okonomi/feature/ja-follow-authentication

[ja] follow up core-libraries/components/authentication section
Merge pull request #681 from dereuromark/master-return-redirect

return early for redirects
Merge pull request #678 from dereuromark/master-round-formhelper-datetime

provide ability for rounding