Fix logging into parent directory

[RiKap]

Hey.
There is a bug, when it create log file in parent directory of $this->directory

• It will skip dot directories, you should ignore them
• Fix bug when $this->directory does not end with directory separator.

How to reproduce?:

1. Set your logDir for TracyLogging as %appDir%/../log
2. Set modo to production
3. Put somewhere in presenter action throw new \Nette\InvalidArgumentException('TEST').
4. On first throw .html will be in log directory, but second .html, of the same exception, will be in parent of log dir.

[coveralls]

Coverage decreased (-0.4%) to 44.444% when pulling c35d2f1 on RiKap:patch-1 into a79d14d on contributte:master.

[RiKap]

@f3l1x What do you think?

[f3l1x]

Hi. Looks good to me. I still dont know how is that possible. I have copied these lines from Tracy.

[RiKap]

@f3l1x See this line https://api.nette.org/2.4/source-Tracy.Logger.php.html#137 Before every log, Tracy add / after $this->directory. This line is missing right now in AbstractLogger. :)

Can you please check #11 and if you approve both PR, release new version. :) Thank you.

[f3l1x]

I see. Thanks.