add new truncate_filename filter
rewrite filename truncation code; ref #53

Conflicts:
	inc/lib/Twig/Extensions/Extension/Tinyboard.php
use new truncate_filename function
Fixed a little exiftool bug

Conflicts:
	post.php
Updated Font Awesome to 4.1.0
Fix issue #180
fix a bug in filename truncation
Merge https://github.com/savetheinternet/Tinyboard