Add docs for oil's "generate module"

Signed-off-by: Philipp Tempel <phtempel@gmail.com>
Merge pull request #621 from philipptempel/patch/oil_module_support

Add docs for oil's "generate module"
Added Arr::keyval_to_assoc docs
htmlタグのlangを"en"から"ja"に変更
Removed wrong default null values
Merge pull request #622 from sagikazarmark/1.8/develop

Added Arr::keyval_to_assoc docs
fixed layout issue
Fix typo in email usage.html
Merge pull request #623 from amityadav4a/patch-1

Fix typo in email usage.html
Fix typo in simpeauth usage.html
Merge pull request #624 from amityadav4a/patch-2

Fix typo in simpeauth usage.html
Removing broken links from tutorials.html

FuelPHP: Separation between Back-End and Front-End (Marco Pace)
FuelPHP: i18n, internationalization of a web application (Marco Pace)

Links are broken and showing 404 page
Fix typo in ormauth usage.html
Merge pull request #625 from amityadav4a/patch-3

Removing broken links from tutorials.html
Merge pull request #626 from amityadav4a/patch-4

Fix typo in ormauth usage.html
documented new 'enclose_numbers' config value; fixed incorrect to_csv() prototype
Merge pull request #495 from sharkpp/fix_html_lang

htmlタグのlangを"en"から"ja"に変更
本家変更分をmerge