FLUME-12: add eclipse project generation to flume build.xml

Review Request #269 - Created July 5, 2010 and submitted

Patrick Hunt
HenryR, jon
this patch adds support for generating eclipse project for flume. It setups the sources and libraries correctly based on classpath, libs, ivy dependencies, etc...

"ant clean-eclipse"
"ant eclipse"

refresh the project in eclipse to reload/rebuild.
"ant eclipse" and loading as a project in eclipse.