[patch] JimiImage check for jimi installation

[Kelly Campbell <ca...@channelpoint.com>]

I made a patch so the JimiImage class can always be compiled in 
and shipped with FOP, but it will report an error similar to the 
previous one if Jimi isn't installed. I was getting a fatal error if I had
JimiImage compiled in my jar, but didn't have Jimi in the classpath at
runtime. 

Here's an example of the new error reported after this patch:

Error while creating area : Error creating FopImage object 
(file:diagrams/api/visitor-sequence.png) : Jimi image library 
not available

The patch is attached. I didn't change anything in the build.xml as the
build will still fail on JimiImage.java unless Jimi is in the classpath.

-Kelly
--
Kelly A. Campbell                       Software Engineer
<ca...@channelpoint.com>                 ChannelPoint, Inc.
<ca...@merlotxml.org>                    Colorado Springs, Co.