Publish kmodule.xsd (with version in filename) to allow code completion in user IDE's

Discussion Mario & Geoffrey:

• The xsd file will be published on drools.org, with a version in the filename under the xsd directory:
  • http://www.drools.org/xsd/kmodule_6_0.xsd
  • http://www.drools.org/xsd/kmodule_6_1.xsd
  • http://www.drools.org/xsd/kmodule_6_2.xsd
  • http://www.drools.org/xsd/kmodule_6_3.xsd
• The version in the filename does not break backwards compatibility because drools 6.3 accepts an kmodule.xml that references kmodule_6_0.xsd
  • Users are recommended but not obligated to change their xsd when upgrading.
  • This is the same versioning strategy as used for web.xml, beans.xml, etc in JEE.
• The target namespace will adjusted to avoid containing a version number (as that does break backwards compatibility when changed)
  • The current proposal is to rename the target namespace to http://drools.org/xsd/kmodule (so it's clear where the xsd's can be found)
• The release procedure will include copying the xsd file during a community .0.Final release.