merge the fix for bug 13 of jsp-glassfish into the jsp-glassfih artifact distributed by jetty and replace core-3.1.1 by ecj-3.5

This fix: https://jsp.dev.java.net/issues/show_bug.cgi?id=13 was accepted and committed in jsp-glassfish trunk.
It can also be applied to the jasper version used by jetty7.
It will add support for eclipse compiler released after 3.1.1: after September 2005.
It will also support ecj which can be loaded in an OSGi container. core-3.1.1 can only be loaded inside eclipse-RCP.

This bug was originally filed here: https://bugs.eclipse.org/bugs/show_bug.cgi?id=289404
and here https://bugs.eclipse.org/bugs/show_bug.cgi?id=289406
But it is related to hightide more than jetty-eclipse so jmcconnell suggested I file it here.

I have forked https://svn.codehaus.org/jetty/jsp/trunk/jsp-2.1-glassfish/ here:
http://github.com/hmalphettes/jetty-jsp-tweaked-for-osgi

The patch suggested to fix this issue is here:
http://github.com/hmalphettes/jetty-jsp-tweaked-for-osgi/commit/006c2f88c12abe7c66f633ac7437471206183f79

It also cherry picks a merge from jsp-glassfish of a method to be able to customize the entity resolver of the tld-parser.