Fix for DS-1528. Use 'maven-antrun-plugin' and native2ascii to encode UTF-8 chars before filtering

NEEDS testing on a Mac!  It contains a new profile which attempts to locate the tools.jar or classes.jar (containing native2ascii) on various platforms. 

On Linux, I've successfully added UTF-8 characters in my build.properties file, and they are now carried over properly into the final dspace.cfg file.