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
Seriously, remove the line ending
Merge pull request #3079 from seanfahey/develop

Added MIME types for .ppt uploads
Updating table template prototype id documentation

Updating template prototype in documentation to reflect the actual
template prototype in the table library.
Merge pull request #3082 from AdwinTrave/develop

Updating table template prototype in documentation
Fix #3085
Fix #3101