added build/dist to ignore
touched up makefile to keep dist builds
wip on #9 and #10
refactored PermissionHelper to use single instance only
closes #9 and #10
updated Makefile to auto open cov
Scrutinizer Auto-Fixes

This patch was automatically generated as part of the following inspection:
https://scrutinizer-ci.com/g/thornag/php-vfs/inspections/9306ba13-0ebc-4be6-9405-9605e8a80389

Enabled analysis tools:
 - PHP Analyzer
 - PHP Copy/Paste Detector
 - PHP PDepend
Update README.md
Update README.md
Update .travis.yml
Update .travis.yml
first batch of scrutinizer fixes