Fix warning in tree.php on empty library folder

Fix warning of undefined variable
Merge pull request #6 from gorekee/patch-1

Fix warning in tree.php on empty library folder
Use correct html5 charset tag
Merge pull request #7 from filp/master

Use correct HTML5 charset tag
Add ability to move config to config.php file
Document config changes in bundled index.md
Merge pull request #8 from filp/feature/split-config

(optionally) define configuration in config.php file (outside VCS)
fix illegal offset type in tree module
Fix bug when folder name is a number

Folder names are handled as indexes. 
This is a problems when a folder is named with an integer.
Fix router logic to handle undefined actions
Merge pull request #12 from filp/master

Fix router (getAction/dispatch) to handle undefined actions
Add initial support for tree filtering
Code cleanup
Add visual cue for result tree navigation
Allow expanding folders in results
Cleanup code & comments
Sanitize query to prevent conflicts with :contains()
Fix search box sizing on Firefox
Auto focus search box on page load
Add visual cues for tree navigation globally