Added base href

Added base href. Note that you use 
```<a class="navbar-brand" href="{{ (!empty($siteUrl)) ? $siteUrl : '/'}} " target="_new">```
in layouts/dashboard/header.blade.php. You could replace this with 
```<a class="navbar-brand" href="{{ Config::get('app.url'); }}" target="_new">```
if you want to full site url there. I did not see an other way to configure the siteurl.

This pull request is part of the solution of this one: https://github.com/MrJuliuss/syntara-logviewer/pull/5