For https://issues.apache.org/bugzilla/show_bug.cgi?id=56990
Add build target ide-eclipse-websocket.

This creates second Eclipse project at ../tomcat-7.0.x-java7 and configures to to build Websocket classes and tests with Java 7.
Note that created project does the following
1. It depends on the main project ("tomcat-7.0.x") as build path dependency.
2. It imports "java" and "test" directories as linked resources from "../trunk/java" and "../trunk/test".


git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1627245 13f79535-47bb-0310-9956-ffa450edef68