INSTALL modifications to clarify JDK and Scala support
INSTALL modifications to clarify JDK and Scala support

Mention that the JDK requirement is JDK 1.6 rather than Sun Java
and that Scala version 2.8 is known to not work at this time.

jds2001/Etherpad-development,jds2001/Etherpad-development,jds2001/Etherpad-development