Fix https://issues.apache.org/bugzilla/show_bug.cgi?id=54461
Improve the documentation for the compiler attribute in the Jasper how-to

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1437637 13f79535-47bb-0310-9956-ffa450edef68
Fix https://issues.apache.org/bugzilla/show_bug.cgi?id=54466
Improve error message by including the name of the file when the java file generated from a tag file cannot be compiled.
Based on a patch by Sheldon Shao.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1437649 13f79535-47bb-0310-9956-ffa450edef68