[Lucene-java Wiki] Update of "HowToContribute" by SteveRowe

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The following page has been changed by SteveRowe:
http://wiki.apache.org/lucene-java/HowToContribute

The comment on the change is:
Modified JVM version code compatibility info: contrib, 2.X, 3.X

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  Modify the source code and add some (very) nice features using your favorite IDE.[[BR]]
  
  But take care about the following points:
+  * Code compatibility:
+     * All core code to be included in 2.X releases should be compatible with Java 1.4.
-  * All code should be compatible with Java 1.4.
+     * All contrib code should be compatible with either Java 5 or 1.4.
+     * All code to be included in 3.X releases should be compatible with Java 5.
   * All public classes and methods should have informative [http://java.sun.com/j2se/javadoc/writingdoccomments/ Javadoc comments].
   * Code should be formatted according to [http://java.sun.com/docs/codeconv/ Sun's conventions] with one exception:
      * indent two spaces per level, not four.