Fix https://issues.apache.org/bugzilla/show_bug.cgi?id=56010
Documentation part of the fix

The constants mentioned in JspFactory.getPageContext(..) belong to JspWriter. There are no such constants in PageContext.
Javadoc in JavaEE 7 (as referenced in bug 56010) has been updated.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1574004 13f79535-47bb-0310-9956-ffa450edef68
Note DBCP update to a release version.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1574052 13f79535-47bb-0310-9956-ffa450edef68
WIP NIO2 connector
Fixes and cleanups for input stability.
Fix output corruption for blocking IO.
Fix async (except keepalive after async), non blocking output, deadlocks and stability.
Fix oops for output corruption, harmonize with other connectors keepalive, fix keepalive after async and fix sendfile.
Fix upgrade mode IO (not sure it is 100% stable yet though), tested with websockets.
Cleanup: drop the poller class.
Oops, missing things after poller removal.
Fix SSL handshake and IO (blocking and non blocking, sendfile).
Fixes and cleanups, add some timeout processing, convert AJP NIO code.