Default to english when no language found

I know I can add extra languages, but this check just defaults to 'en'. This prevents errors on the foreach.

But I actually think that those SAPI value's should not be in a language file, but in the config. (What if you want to add extra values?)
Wrong is_array check

Gives error when not an array.
Change order when option is set.
Add log_order option
Strtolower the config

So DESC also works
Merge pull request #21 from barryvdh/patch-2

Wrong is_array check
Merge pull request #23 from barryvdh/patch-3

Add option to reverse order of log entries
Update README.md

Add `log_order` config option documentation.
Merge pull request #20 from barryvdh/patch-1

Default to english when no language found
Fix issue with first log not being displayed. Fixes #25.