new feature: declare html attributes per css

# CssToInlineStyles now also enables you to declare HTML attributes per CSS.

### example usage:
> td {
>   attr-align: left;
>   attr-cellpadding: 0;
>   attr-cellspacing: 0;
> }

### new vars:
> $attributePrefix, $catchAttributes

### new functions:
> isAttribute, setAttributePrefix, dump
extended: processCSSProperties