Add document of Arr::search()
Add document of Input::extension()
Merge pull request #509 from hackoh/1.6/input_extension

Add document of Input::extension()
Merge pull request #508 from hackoh/1.6/arr_search

Add document of Arr::search()
Updated Arr::search  to true.
updated the docs for Security::check_token(). Related fuel/core/#1324
Update packages/auth/intro.html

Added iterations config item help
Merge pull request #510 from addobandre/1.6/develop

Configurable PBKDF2 iterations number help item
updated the use of Theme::use_modules()
updated theme class docs
updated csrf autoload documentation
Fix excess parentheses
coverage report option needs '='
Merge pull request #511 from ryanoreilly/1.6/develop

Fix excess parentheses
Merge pull request #512 from orcaaoshi/patch-10

coverage report option needs '='