Add sakai-start-java6 startup scripts for sakai-2.6.3 demo

Both 2.6.3 and 2.7+ demos bundle up Tomcat 5.5.30. Strict quote escaping, required by Tomcat 5.5.27+ is set in both scripts. Java 1.5 users can use the default script safely.

start-sakai.sh/bat:

https://sakaiproject.atlassian.net/browse/SAK-18044#icft=SAK-18044 -Dhttp.agent=Sakai
SAK-17425, https://sakaiproject.atlassian.net/browse/SAK-15736#icft=SAK-15736 (Tomcat 5.5.27+) -Dorg.apache.jasper.compiler.Parser.STRICT_QUOTE_ESCAPING=false

start-sakai-java6.sh/bat

https://sakaiproject.atlassian.net/browse/SAK-18044#icft=SAK-18044 -Dhttp.agent=Sakai
SAK-18779, SAK-18779, SAK-17425, https://sakaiproject.atlassian.net/browse/SAK-15736#icft=SAK-15736 (Tomcat 5.5.27+) -Dorg.apache.jasper.compiler.Parser.STRICT_QUOTE_ESCAPING=false
https://sakaiproject.atlassian.net/browse/SAK-17578#icft=SAK-17578 (Java 1.6): -Dsun.lang.ClassLoader.allowArraySyntax=true

The start-sakai.sh/bat does not include:

-Djava.awt.headless=true

but this omission represents the status quo as of 2.6.2.

Actually one of these new parameters is related to tomcat version, and one to java version. So java 5 users would need to use the java 6 startup script, or preferably we should just have one startup script.

Added to 2.6.x and 2.6.3.