Fix #3057
fix callable hooks
fix callable hooks
Merge pull request #3065 from dtmax/develop

fix calling of callable hooks
A fix about loading language files - ensuring suffix '_lang' presence properly.
Merge pull request #3072 from ivantcholakov/develop

A fix about loading language files - ensuring suffix '_lang' presence properly.
Added _display documentation.
[ci skip] Update changelog
[ci skip] Update changelog
Remove CI_Encrypt::_xor_encode()
Add support for non-ASCII domain names in FV & Email classes' valid_email()

Depends on the Intl extension
Fixed code style.
reduced line length.
Fix wrong variable name
Merge pull request #3074 from aanbar/output_documentation

Added _display documentation.
Fix a potential undefined variable error
Merge branch 'develop' of github.com:EllisLab/CodeIgniter into develop
Added 'application/vnd.ms-office' MIME for ppt

An export from Apple's Numbers to .ppt gives a MIME of application/vnd.ms-office
Another ppt mime type
Removed errant newline