Default log location

[dddaaammmooo]

No so much a bug, just my 2 cents.

The default log location dumps the files into the 'public' folder, which confused the hell out of me for a while as I was getting permission denied errors (given this is not writable on my server). After a trawl of the code I eventually discovered the JIRA_LOG_FILE variable, however in it's absence I would be inclined to suggest the code defaults to the Laravel 'storage/logs' folder as this is more likely writable than 'public'.

Probably also a good idea to list the .env setting in the install instructions as I only discovered it after searching the code.

[lesstif]

thanks for your suggestion.

it is the reasonable comment for laravel user, but this project is the PHP package, not the laravel package.

however, since it may confuse users of laravel framework, I will be write down the log file settings in the README.md.