Remove empty brackets from log files

The current log files generated by Laravel all show empty brackets at the end of log files. We can remove these by using the $ignoreEmptyContextAndExtra parameter in the default Monolog LineFormatter.

http://stackoverflow.com/questions/13968967/how-not-to-show-last-bracket-in-a-monolog-log-line
Fixing conflicts.
Merge branch 'master' of github.com:laravel/framework