Made "Release Information" more readable.

The first time I read that paragraph it made no sense. The addition of a hyphen makes it easier to read at a glance.
Drop the unused  parameter from log_message() / CI_Log::write_log()
Improvements to safe_mode detection (it doesn't exist in PHP 5.4)
Update MySQLi to use the PHP API for transactions, where possible
Merge pull request #2641 from aanbar/develop

Fixed issue #2638
Fix a PostgreSQL string escaping bug and use pg_escape_literal() when possible
Fix #2639
Fix array notation fields for set_select() as well
[ci skip] Fix a changelog message
An update to the #2639 fix
Another one following #2639
Updated config to include list of valid characters to `sess_cookie_name`

Added list of valid characters to sess_cookie_name
Update config.php

Removed new line
Merge pull request #2643 from brenjt/patch-1

Updated config to include list of valid characters to `sess_cookie_name`
[ci skip] Remove empty line at application/config/config.php EOF
No need of this anymore
No need of this anymore
Merge pull request #2644 from vkeranov/develop

No need of these comment lines anymore
[ci skip] Remove empty lines
Adding missing reference to min_length in rules reference