Change GateIn Context path

For Jboss bundle here: http://community.jboss.org/wiki/ChangeGateInContextPath
For Tomcat bundle, we change some files:
1. Rename portal.war->myportal.war
2. In myportal.war/WEB-INF/web.xml
Change to myportal
3. gatein/conf/configuration.xml

default.portal.container
myportal

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4. To avoid some other exceptions:
- Rename tomcat/conf/Catalina/portal.xml to tomcat/conf/Catalina/myportal.xml
- Change some value related to docBase to myportal value