[dev] Potential addition/learning for horde-js-compress.php

[Michael M Slusarz]

Quoting Chuck Hagenbuch <chuck at horde.org>:

> Mostly for Michael-
>
> Not sure if our js compression routine can learn something (or maybe
> avoid the java dependency?) using http://dean.edwards.name/packer/.

Added the PHP class as an option for compression.  However, using an  
algorithim that simply shrinks the current code via name  
substitutions/whitespace cleaning, the PHP class is not as good as our  
current method - with the subtracted benefit that the rhino parser  
also does JS syntax checking during compression.  The more advanced  
compression methods in the packer class require regex substitutions  
every time the javascript code is loaded, which is a performance hit  
that isn't necessary (a JS shrunk file coupled with gzip compression  
on the server should provide more than adequate compression for our  
purposes).

michael