Better introduction of the Manager web application.
Added mention of Tomcat Maven Plugin project.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1456713 13f79535-47bb-0310-9956-ffa450edef68
s/7.0/8.0/

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1456714 13f79535-47bb-0310-9956-ffa450edef68
Context descriptors are not created for deployed apps in Tomcat 7.
Minor tweaks.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1456716 13f79535-47bb-0310-9956-ffa450edef68
Correct example. (The manager webapp was in server/webapps in TC 5.5, but not now.)
Add RemoteAddrValve to Manager configuration examples.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1456721 13f79535-47bb-0310-9956-ffa450edef68