Prevent assets from loading multiple times. Caused an issue where character count wasn't updated when having sections with multiple textbox fields.
Class 'invalid' inherits styles from Symphony core, overlays content in textbox field when reaching the character limit. Changed class name.
Using mb_strlen(, 'utf-8') instead of strlen() to account for special characters when checking content length.
made safe for use on servers without the multibyte extension
improved character limit readability on invalid fields
Merge pull request #20 from jensscherbl/master

Fixed a few bugs