This adds the ability to include attribute values for any element that
can be altered by a moustache.
Form:
```
{attribute=value}
example:
 {position:absolute,bottom:20px,left:130px,width:220px,a=b and c,g=h}
```
In order to permit spaces, the pattern matches for moustache code had to
remove the space character as a delimiter. I believe I have adequate
compensated.
This should solve #1488
