kie-server: use spaces instead of tabs in POMs
kie-server: use org.jboss.spec.javax.servlet instead of javax.servlet

 * using JBoss spec deps as those are the preffered ones in
   Drools/jBPM code
kie-server: use version of maven-war-plugin that comes from parent
Merge pull request #91 from psiroky/kie-server-small-fixes

Kie server small fixes